diff --git a/app/components/ui/icons.tsx b/app/components/ui/icons.tsx
index d990b19..abb57d8 100644
--- a/app/components/ui/icons.tsx
+++ b/app/components/ui/icons.tsx
@@ -110,6 +110,19 @@ export const COPY_SQUARES_PATH_40 =
 export const COPY_SQUARES_MORPH_ICON = fitIcon(COPY_SQUARES_PATH_40, 40);
 export const COPY_SQUARES_MORPH_STROKE_WIDTH = 2.5 * (24 / 40);
 
+// X (Twitter) logo, copied from BDS `packages/icons/src/svg/2/x-twitter.svg`
+// (40x40 grid, glyph inset like the rest of the BDS set).
+export function XTwitterIcon({ size = 20, className }: { size?: number; className?: string }) {
+  return (
+    <svg aria-hidden="true" width={size} height={size} viewBox="0 0 40 40" fill="none" className={className}>
+      <path
+        fill="currentColor"
+        d="M21.8609 18.4692L29.1425 10.0049H27.417L21.0943 17.3543L16.0445 10.0049H10.2201L17.8564 21.1185L10.2201 29.9946H11.9457L18.6225 22.2334L23.9555 29.9946H29.78L21.8604 18.4692H21.8609ZM19.4974 21.2164L18.7237 20.1098L12.5674 11.3039H15.2179L20.186 18.4105L20.9598 19.5172L27.4178 28.7547H24.7673L19.4974 21.2168V21.2164Z"
+      />
+    </svg>
+  );
+}
+
 export function CheckIcon({ size = 16, className }: { size?: number; className?: string }) {
   return (
     <svg
diff --git a/app/vibenet/demos/200/BlockRunner.tsx b/app/vibenet/demos/200/BlockRunner.tsx
index 8bc0aab..ad3d0de 100644
--- a/app/vibenet/demos/200/BlockRunner.tsx
+++ b/app/vibenet/demos/200/BlockRunner.tsx
@@ -16,9 +16,10 @@
 import { useCallback, useEffect, useRef, useState } from 'react';
 
 import { Button } from '../../../components/ui/Button';
+import { XTwitterIcon } from '../../../components/ui/icons';
 import { Text } from '../../../components/ui/Text';
 import { trackBlockRunnerShare } from '../../../analytics/events';
-import { VIBENET_EXPLORER_PATH, VIBENET_RPC_URL, VIBENET_WS_URL } from '../../library/config';
+import { VIBENET_RPC_URL, VIBENET_WS_URL } from '../../library/config';
 import { connectJsonRpcStream } from '../validity/lib/stream';
 import {
   BOSS_X,
@@ -42,14 +43,6 @@ import {
   type Head,
 } from './lib/game';
 import gluttonSheet from './glutton-sheet-v2.png';
-import {
-  fetchBest,
-  fetchBoard,
-  scoreWallet,
-  shortAddr,
-  submitScore,
-  type BoardEntry,
-} from './lib/leaderboard';
 import { pickShareVariant, shareText, type ShareVariant, xShareUrl } from './lib/share';
 import { Sound } from './lib/sound';
 import {
@@ -640,11 +633,10 @@ export function BlockRunner() {
   // Immersive takeover: the game fills the viewport by default on load.
   // (True fullscreen needs a user gesture, so this is the load-time version.)
   const [immersive, setImmersive] = useState(true);
-  const [board, setBoard] = useState<BoardEntry[]>([]);
-  const [chainBest, setChainBest] = useState(0);
-  const [myAddress, setMyAddress] = useState<string | null>(null);
-  const [submitState, setSubmitState] = useState<'' | 'funding' | 'submitting' | 'confirming' | 'done' | 'error'>('');
   const stageRef = useRef<HTMLDivElement | null>(null);
+  // Where the canvas actually draws inside the stage (it letterboxes with
+  // object-contain), so DOM overlays can sit in game space and scale with it.
+  const [canvasBox, setCanvasBox] = useState<{ x: number; y: number; scale: number } | null>(null);
   const [score, setScore] = useState(0);
   const [best, setBest] = useState(0);
   const [phase, setPhase] = useState<Game['phase']>('ready');
@@ -765,48 +757,6 @@ export function BlockRunner() {
     };
   }, [apply, setFeed]);
 
-  // Onchain high scores: poll the board, know our own best.
-  useEffect(() => {
-    let cancelled = false;
-    const wallet = scoreWallet();
-    // Deferred so the effect body itself does not set state synchronously.
-    const t = window.setTimeout(() => setMyAddress(wallet.address), 0);
-    const load = async () => {
-      try {
-        const [entries, mine] = await Promise.all([fetchBoard(), fetchBest(wallet.address)]);
-        if (!cancelled) {
-          setBoard(entries);
-          setChainBest(mine);
-        }
-      } catch {
-        /* Board is decoration; the next poll retries (or the chain regenesised). */
-      }
-    };
-    void load();
-    const id = window.setInterval(() => {
-      if (!document.hidden) void load();
-    }, 12_000);
-    return () => {
-      cancelled = true;
-      window.clearTimeout(t);
-      window.clearInterval(id);
-    };
-  }, []);
-
-  const postScore = useCallback(async () => {
-    const s = gameRef.current.score;
-    if (s <= 0 || submitState === 'funding' || submitState === 'submitting' || submitState === 'confirming') return;
-    setSubmitState('funding');
-    try {
-      await submitScore(s, (st) => setSubmitState(st));
-      setSubmitState('done');
-      setChainBest((b) => Math.max(b, s));
-      setBoard(await fetchBoard());
-    } catch {
-      setSubmitState('error');
-    }
-  }, [submitState]);
-
   const shareOnX = useCallback(() => {
     trackBlockRunnerShare(shareVariant, score);
     window.open(xShareUrl(shareText(score, shareVariant)), '_blank', 'noopener,noreferrer');
@@ -821,6 +771,28 @@ export function BlockRunner() {
     else if (stage.requestFullscreen) void stage.requestFullscreen();
   }, []);
 
+  useEffect(() => {
+    const canvas = canvasRef.current;
+    const stage = stageRef.current;
+    if (!canvas || !stage) return;
+    const measure = () => {
+      const c = canvas.getBoundingClientRect();
+      const st = stage.getBoundingClientRect();
+      const scale = Math.min(c.width / WIDTH, c.height / HEIGHT);
+      if (!(scale > 0)) return;
+      setCanvasBox({
+        x: c.left - st.left + (c.width - WIDTH * scale) / 2,
+        y: c.top - st.top + (c.height - HEIGHT * scale) / 2,
+        scale,
+      });
+    };
+    measure();
+    const ro = new ResizeObserver(measure);
+    ro.observe(canvas);
+    ro.observe(stage);
+    return () => ro.disconnect();
+  }, [immersive, isFullscreen]);
+
   useEffect(() => {
     const onChange = () => setIsFullscreen(Boolean(document.fullscreenElement));
     document.addEventListener('fullscreenchange', onChange);
@@ -830,7 +802,6 @@ export function BlockRunner() {
   // Input.
   const doTap = useCallback(() => apply(tap(gameRef.current)), [apply]);
   const doRestart = useCallback(() => {
-    setSubmitState((st) => (st === 'done' || st === 'error' ? '' : st));
     apply(restart(gameRef.current));
   }, [apply]);
 
@@ -1024,9 +995,6 @@ export function BlockRunner() {
         aria-label={`Block Runner. ${phase === 'running' ? `Score ${score}.` : 'Tap space or the screen to start eating.'}`}
         role="img"
       />
-      {/* Once a submit starts, the board's own poll can raise chainBest past
-          the score mid-flight — keep the prompt mounted on submitState so the
-          progress and the success line survive their own success. */}
       <div className="pointer-events-none absolute inset-x-0 top-2 flex items-start justify-between px-4">
         <div className="flex flex-col gap-0.5">
           <span className="text-[10px] uppercase tracking-[0.6px] text-white/60">Latest block</span>
@@ -1041,40 +1009,34 @@ export function BlockRunner() {
           <GameStat label="Best" value={String(best)} />
         </div>
       </div>
-      {phase === 'dead' && score > 0 ? (
-        <div className="absolute inset-x-0 bottom-[7%] flex justify-center">
-          <div className="flex items-center gap-3 rounded-xl border border-bds-blue-60 bg-[#0b1030]/95 px-4 py-3 shadow-lg">
-            <Button size="sm" variant="secondary" onClick={shareOnX}>
+      {phase === 'dead' && score > 0 && canvasBox ? (
+        (() => {
+          // Sized in game pixels so it keeps the same proportion to the
+          // game-over card at any screen size: centred on the road strip,
+          // about as tall as the card's TAP TO RUN AGAIN bar, clamped to a
+          // usable touch target on phones and BDS lg-ish on big screens.
+          const { x, y, scale } = canvasBox;
+          const height = Math.round(Math.min(64, Math.max(36, 30 * scale)));
+          const fontSize = Math.round(Math.min(22, Math.max(13, 10 * scale)));
+          return (
+            <Button
+              onClick={shareOnX}
+              className="absolute -translate-x-1/2 -translate-y-1/2"
+              style={{
+                left: x + (WIDTH / 2) * scale,
+                top: y + (GROUND_Y + 30) * scale,
+                height,
+                paddingInline: Math.round(height * 0.45),
+                gap: Math.round(fontSize * 0.4),
+                fontSize,
+                lineHeight: 1,
+              }}
+            >
+              <XTwitterIcon size={Math.round(fontSize * 1.6)} className="-ml-[0.3em]" />
               Share on X
             </Button>
-            {score <= chainBest && submitState === '' ? null : submitState === 'done' ? (
-              <Text variant="label.regular" className="text-bds-blue-15">
-                On the board — tap the game to run again.
-              </Text>
-            ) : (
-              <>
-                <Text variant="label.regular" className="text-bds-blue-15">
-                  New onchain best!
-                </Text>
-                <Button
-                  size="sm"
-                  onClick={() => void postScore()}
-                  disabled={submitState === 'funding' || submitState === 'submitting' || submitState === 'confirming'}
-                >
-                  {submitState === 'funding'
-                    ? 'Funding wallet…'
-                    : submitState === 'submitting'
-                      ? 'Submitting…'
-                      : submitState === 'confirming'
-                        ? 'Confirming…'
-                        : submitState === 'error'
-                          ? 'Retry post'
-                          : `Post ${score} onchain`}
-                </Button>
-              </>
-            )}
-          </div>
-        </div>
+          );
+        })()
       ) : null}
       {immersive && !isFullscreen ? (
         <div className="absolute bottom-4 right-4 flex items-center gap-2">
@@ -1099,89 +1061,6 @@ export function BlockRunner() {
       ) : null}
       </div>
 
-      <section className="flex flex-col gap-2">
-        <div className="flex flex-wrap items-center justify-between gap-2">
-          <Text variant="headline">Onchain high scores</Text>
-          <div className="flex items-center gap-3">
-            {/* Once a submit starts, the board's own poll can raise chainBest past
-          the score mid-flight — keep the prompt mounted on submitState so the
-          progress and the success line survive their own success. */}
-      <div className="pointer-events-none absolute inset-x-0 top-2 flex items-start justify-between px-4">
-        <div className="flex flex-col gap-0.5">
-          <span className="text-[10px] uppercase tracking-[0.6px] text-white/60">Latest block</span>
-          <div className="font-doto text-[22px] leading-none tabular-nums text-white">
-            {head ? head.number.toLocaleString() : '———'}
-            {slot ? <span className="text-bds-blue-30"> {slot}</span> : null}
-          </div>
-        </div>
-        <div className="flex items-start gap-6">
-          <GameStat label="Blocks / s" value={rate.toFixed(1)} />
-          <GameStat label="Eaten" value={String(score)} />
-          <GameStat label="Best" value={String(best)} />
-        </div>
-      </div>
-      {phase === 'dead' && score > 0 && (score > chainBest || submitState !== '') ? (
-              <Button
-                variant="secondary"
-                size="sm"
-                onClick={() => void postScore()}
-                disabled={submitState === 'funding' || submitState === 'submitting' || submitState === 'confirming'}
-              >
-                {submitState === 'funding'
-                  ? 'Funding wallet…'
-                  : submitState === 'submitting'
-                    ? 'Submitting…'
-                    : submitState === 'confirming'
-                      ? 'Confirming…'
-                      : `Post ${score} onchain`}
-              </Button>
-            ) : null}
-            {submitState === 'error' ? (
-              <Text variant="footnote" className="text-bds-red-60">
-                Submission failed — try again.
-              </Text>
-            ) : null}
-          </div>
-        </div>
-        <div className="overflow-hidden rounded-lg border border-bds-gray-10 dark:border-white/10">
-          {board.length === 0 ? (
-            <Text variant="label.regular" tone="muted" className="block px-4 py-3">
-              No scores onchain yet — die proudly and post yours.
-            </Text>
-          ) : (
-            <ul className="divide-y divide-bds-gray-10 dark:divide-white/10">
-              {board.map((e, i) => (
-                <li
-                  key={e.player}
-                  className={`flex items-center gap-3 px-4 py-2 text-[13px] ${
-                    myAddress && e.player.toLowerCase() === myAddress.toLowerCase() ? 'bg-bds-blue-0' : ''
-                  }`}
-                >
-                  <span className="w-6 shrink-0 text-bds-gray-50">{i + 1}</span>
-                  <a
-                    href={`${VIBENET_EXPLORER_PATH}/address/${e.player}`}
-                    target="_blank"
-                    rel="noreferrer"
-                    className="font-mono text-base-blue hover:underline"
-                  >
-                    {shortAddr(e.player)}
-                  </a>
-                  {myAddress && e.player.toLowerCase() === myAddress.toLowerCase() ? (
-                    <span className="text-[11px] uppercase tracking-[0.6px] text-bds-gray-50">you</span>
-                  ) : null}
-                  <span className="ml-auto font-doto text-[18px] tabular-nums">{e.score}</span>
-                </li>
-              ))}
-            </ul>
-          )}
-        </div>
-        <Text variant="footnote" tone="muted">
-          Your browser plays as{' '}
-          {myAddress ? <span className="font-mono">{shortAddr(myAddress as `0x${string}`)}</span> : '…'} and the
-          faucet funds its first submission.
-        </Text>
-      </section>
-
       <div className="grid gap-6 border-t border-bds-gray-10 pt-6 sm:grid-cols-2 dark:border-white/10">
         <section className="flex flex-col gap-2">
           <Text variant="label">How to play</Text>
@@ -1203,7 +1082,6 @@ export function BlockRunner() {
               'Block height follows gas used.',
               `Swallow a block to read its number and slot${head ? `, like ${blockLabel(head)}` : ''}.`,
               'The beat runs at one note per block.',
-              'Scores live in a contract on vibenet, keyed by the wallet that posted them. A devnet regenesis wipes the board.',
             ]}
           />
         </section>
diff --git a/app/vibenet/demos/200/contract/BlockRunnerScores.json b/app/vibenet/demos/200/contract/BlockRunnerScores.json
deleted file mode 100644
index 1457b03..0000000
--- a/app/vibenet/demos/200/contract/BlockRunnerScores.json
+++ /dev/null
@@ -1,107 +0,0 @@
-{
-  "abi": [
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "player",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint96",
-          "name": "score",
-          "type": "uint96"
-        }
-      ],
-      "name": "NewScore",
-      "type": "event"
-    },
-    {
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "name": "best",
-      "outputs": [
-        {
-          "internalType": "uint96",
-          "name": "",
-          "type": "uint96"
-        }
-      ],
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "board",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "player",
-          "type": "address"
-        },
-        {
-          "internalType": "uint96",
-          "name": "score",
-          "type": "uint96"
-        }
-      ],
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "inputs": [
-        {
-          "internalType": "uint96",
-          "name": "score",
-          "type": "uint96"
-        }
-      ],
-      "name": "submit",
-      "outputs": [],
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "inputs": [],
-      "name": "top",
-      "outputs": [
-        {
-          "components": [
-            {
-              "internalType": "address",
-              "name": "player",
-              "type": "address"
-            },
-            {
-              "internalType": "uint96",
-              "name": "score",
-              "type": "uint96"
-            }
-          ],
-          "internalType": "struct BlockRunnerScores.Entry[10]",
-          "name": "",
-          "type": "tuple[10]"
-        }
-      ],
-      "stateMutability": "view",
-      "type": "function"
-    }
-  ],
-  "bytecode": "0x6080604052348015600e575f5ffd5b506106608061001c5f395ff3fe608060405234801561000f575f5ffd5b506004361061004a575f3560e01c806312ca564f1461004e57806328ed6e3f14610063578063d53bb092146100a2578063fe6dcdba146100e2575b5f5ffd5b61006161005c36600461051b565b6100f7565b005b610076610071366004610548565b610446565b604080516001600160a01b0390931683526001600160601b039091166020830152015b60405180910390f35b6100ca6100b036600461055f565b600a6020525f90815260409020546001600160601b031681565b6040516001600160601b039091168152602001610099565b6100ea610475565b6040516100999190610585565b5f816001600160601b0316116101415760405162461bcd60e51b815260206004820152600a6024820152697a65726f2073636f726560b01b60448201526064015b60405180910390fd5b335f908152600a60205260409020546001600160601b039081169082161161019b5760405162461bcd60e51b815260206004820152600d60248201526c1b9bdd081e5bdd5c8818995cdd609a1b6044820152606401610138565b335f818152600a602090815260409182902080546bffffffffffffffffffffffff19166001600160601b03861690811790915591519182527f41962b14da4c981f83dac8e262111e9ad37614600f0ea9f119b03af61c544162910160405180910390a2600a5f5b600a81101561023e57335f82600a811061021e5761021e6105d4565b01546001600160a01b0316036102365780915061023e565b600101610202565b5080600a03610284576009546001600160a01b0316158015906102775750600954600160a01b90046001600160601b0390811690831611155b15610280575050565b5060095b604080518082019091523381526001600160601b03831660208201525f82600a81106102b2576102b26105d4565b82516020909301516001600160601b0316600160a01b026001600160a01b03909316929092179101555b5f8111801561033a57505f6102f26001836105fc565b600a8110610302576103026105d4565b0154600160a01b90046001600160601b03165f82600a8110610326576103266105d4565b0154600160a01b90046001600160601b0316115b15610442575f8061034c6001846105fc565b600a811061035c5761035c6105d4565b604080518082019091529101546001600160a01b0381168252600160a01b90046001600160601b0316602082015290505f82600a811061039e5761039e6105d4565b015f6103ab6001856105fc565b600a81106103bb576103bb6105d4565b8254910180546001600160a01b0319166001600160a01b03909216918217815591546001600160601b03600160a01b918290041602179055805f83600a8110610406576104066105d4565b82516020909301516001600160601b0316600160a01b026001600160a01b03909316929092179101558161043981610615565b925050506102dc565b5050565b5f81600a8110610454575f80fd5b01546001600160a01b0381169150600160a01b90046001600160601b031682565b61047d6104e2565b6040805161014081019091525f600a81835b828210156104d95760408051808201909152848301546001600160a01b0381168252600160a01b90046001600160601b03166020808301919091529082526001909201910161048f565b50505050905090565b604051806101400160405280600a905b604080518082019091525f80825260208201528152602001906001900390816104f25790505090565b5f6020828403121561052b575f5ffd5b81356001600160601b0381168114610541575f5ffd5b9392505050565b5f60208284031215610558575f5ffd5b5035919050565b5f6020828403121561056f575f5ffd5b81356001600160a01b0381168114610541575f5ffd5b610280810181835f5b600a8110156105cb57815180516001600160a01b031684526020908101516001600160601b0316818501526040909301929091019060010161058e565b50505092915050565b634e487b7160e01b5f52603260045260245ffd5b634e487b7160e01b5f52601160045260245ffd5b8181038181111561060f5761060f6105e8565b92915050565b5f81610623576106236105e8565b505f19019056fea264697066735822122065c9501d2b15d374c83f39a8c53052366e0254c856e9a850d97efc826538ddcc64736f6c634300081c0033",
-  "solc": "0.8.28",
-  "optimizer": 200
-}
diff --git a/app/vibenet/demos/200/contract/BlockRunnerScores.sol b/app/vibenet/demos/200/contract/BlockRunnerScores.sol
deleted file mode 100644
index bfe512d..0000000
--- a/app/vibenet/demos/200/contract/BlockRunnerScores.sol
+++ /dev/null
@@ -1,51 +0,0 @@
-// SPDX-License-Identifier: MIT
-pragma solidity ^0.8.24;
-
-/// Block Runner's onchain high-score board (vibenet devnet).
-/// No names — a score belongs to the wallet that submitted it, and only a
-/// wallet's best is kept. The top ten live in a fixed array, sorted on write
-/// so reading is one call. NOTE: vibenet is regenesised periodically; when
-/// that happens, redeploy with deploy.mjs and update the address constant in
-/// ../lib/leaderboard.ts.
-contract BlockRunnerScores {
-    struct Entry {
-        address player;
-        uint96 score;
-    }
-
-    Entry[10] public board;
-    mapping(address => uint96) public best;
-
-    event NewScore(address indexed player, uint96 score);
-
-    function submit(uint96 score) external {
-        require(score > 0, "zero score");
-        require(score > best[msg.sender], "not your best");
-        best[msg.sender] = score;
-        emit NewScore(msg.sender, score);
-
-        // Find the sender's existing slot, or take the last one if they beat it.
-        uint256 idx = 10;
-        for (uint256 i = 0; i < 10; i++) {
-            if (board[i].player == msg.sender) {
-                idx = i;
-                break;
-            }
-        }
-        if (idx == 10) {
-            if (board[9].player != address(0) && score <= board[9].score) return;
-            idx = 9;
-        }
-        board[idx] = Entry(msg.sender, score);
-        while (idx > 0 && board[idx].score > board[idx - 1].score) {
-            Entry memory t = board[idx - 1];
-            board[idx - 1] = board[idx];
-            board[idx] = t;
-            idx--;
-        }
-    }
-
-    function top() external view returns (Entry[10] memory) {
-        return board;
-    }
-}
diff --git a/app/vibenet/demos/200/contract/deploy.mjs b/app/vibenet/demos/200/contract/deploy.mjs
deleted file mode 100644
index e236c82..0000000
--- a/app/vibenet/demos/200/contract/deploy.mjs
+++ /dev/null
@@ -1,31 +0,0 @@
-// Deploy BlockRunnerScores to vibenet and print the address.
-//
-//   node app/vibenet/demos/200/contract/deploy.mjs
-//
-// Uses DEPLOYER_PK if set; otherwise generates a throwaway key and funds it
-// from the vibenet faucet. After a vibenet regenesis, run this again and put
-// the printed address into app/vibenet/demos/200/lib/leaderboard.ts.
-import { readFileSync } from 'node:fs';
-import { createPublicClient, createWalletClient, http } from 'viem';
-import { generatePrivateKey, privateKeyToAccount } from 'viem/accounts';
-
-const RPC = process.env.VIBENET_RPC_URL || 'https://rpc.vibes.base.org';
-const FAUCET = 'https://api.vibes.base.org/api/vibenet/faucet/drip';
-const chain = { id: 84538453, name: 'Vibenet', nativeCurrency: { name: 'Ether', symbol: 'ETH', decimals: 18 }, rpcUrls: { default: { http: [RPC] } } };
-const artifact = JSON.parse(readFileSync(new URL('./BlockRunnerScores.json', import.meta.url), 'utf8'));
-
-const pk = process.env.DEPLOYER_PK ?? generatePrivateKey();
-const account = privateKeyToAccount(pk);
-const pub = createPublicClient({ chain, transport: http(RPC) });
-const wallet = createWalletClient({ account, chain, transport: http(RPC) });
-
-if ((await pub.getBalance({ address: account.address })) === 0n) {
-  console.log('funding deployer', account.address, 'from faucet…');
-  const res = await fetch(FAUCET, { method: 'POST', headers: { 'content-type': 'application/json' }, body: JSON.stringify({ address: account.address }) });
-  if (!res.ok) throw new Error(`faucet: ${res.status} ${await res.text()}`);
-  while ((await pub.getBalance({ address: account.address })) === 0n) await new Promise((r) => setTimeout(r, 500));
-}
-
-const hash = await wallet.deployContract({ abi: artifact.abi, bytecode: artifact.bytecode });
-const receipt = await pub.waitForTransactionReceipt({ hash, pollingInterval: 200 });
-console.log('BlockRunnerScores deployed at:', receipt.contractAddress);
diff --git a/app/vibenet/demos/200/lib/leaderboard.test.ts b/app/vibenet/demos/200/lib/leaderboard.test.ts
deleted file mode 100644
index 4d7641f..0000000
--- a/app/vibenet/demos/200/lib/leaderboard.test.ts
+++ /dev/null
@@ -1,27 +0,0 @@
-import { describe, expect, it } from 'vitest';
-
-import { parseBoard, shortAddr } from './leaderboard';
-
-const A = '0x1111111111111111111111111111111111111111' as const;
-const B = '0x2222222222222222222222222222222222222222' as const;
-const ZERO = '0x0000000000000000000000000000000000000000' as const;
-
-describe('shortAddr', () => {
-  it('keeps only the ends of the address — that IS the name on the board', () => {
-    expect(shortAddr('0x24411613aab0b4f551942f50af090941bd57e07d')).toBe('0x2441…e07d');
-  });
-});
-
-describe('parseBoard', () => {
-  it('drops empty slots from the fixed-size board', () => {
-    const board = parseBoard([
-      { player: A, score: 42n },
-      { player: B, score: 7n },
-      ...Array.from({ length: 8 }, () => ({ player: ZERO, score: 0n })),
-    ]);
-    expect(board).toEqual([
-      { player: A, score: 42 },
-      { player: B, score: 7 },
-    ]);
-  });
-});
diff --git a/app/vibenet/demos/200/lib/leaderboard.ts b/app/vibenet/demos/200/lib/leaderboard.ts
deleted file mode 100644
index 41cb655..0000000
--- a/app/vibenet/demos/200/lib/leaderboard.ts
+++ /dev/null
@@ -1,115 +0,0 @@
-// Block Runner's onchain high-score board. No names: a score belongs to the
-// wallet address that submitted it, and only your best is kept. Each browser
-// gets a throwaway devnet key (localStorage); the first submission funds it
-// from the vibenet faucet. The contract keeps the top ten sorted, so reading
-// is one call.
-//
-// Vibenet is regenesised periodically. When the board vanishes, redeploy with
-// contract/deploy.mjs and update SCORES_ADDRESS below.
-import { createPublicClient, createWalletClient, http, type Address, type Hex } from 'viem';
-import { generatePrivateKey, privateKeyToAccount } from 'viem/accounts';
-
-import { VIBENET_RPC_URL } from '../../../library/config';
-import { vibenetApi } from '../../../library/client';
-import artifact from '../contract/BlockRunnerScores.json';
-
-export const SCORES_ADDRESS: Address = '0x24411613aab0b4f551942f50af090941bd57e07d';
-
-const KEY_STORAGE = 'block-runner:pk';
-
-const chain = {
-  id: 84538453,
-  name: 'Vibenet',
-  nativeCurrency: { name: 'Ether', symbol: 'ETH', decimals: 18 },
-  rpcUrls: { default: { http: [VIBENET_RPC_URL] } },
-} as const;
-
-export type BoardEntry = { player: Address; score: number };
-
-const ZERO: Address = '0x0000000000000000000000000000000000000000';
-
-/** Drop empty slots and normalize the fixed-size board the contract returns. */
-export function parseBoard(raw: readonly { player: Address; score: bigint }[]): BoardEntry[] {
-  return raw
-    .filter((e) => e.player !== ZERO && e.score > 0n)
-    .map((e) => ({ player: e.player, score: Number(e.score) }));
-}
-
-/** `0x1234…abcd` — the whole identity on the board. */
-export function shortAddr(a: Address): string {
-  return `${a.slice(0, 6)}…${a.slice(-4)}`;
-}
-
-function pub() {
-  return createPublicClient({ chain, transport: http(VIBENET_RPC_URL) });
-}
-
-/** The browser's throwaway score wallet (created on first use). */
-export function scoreWallet(): { address: Address; pk: Hex } {
-  let pk: Hex | null = null;
-  try {
-    pk = window.localStorage.getItem(KEY_STORAGE) as Hex | null;
-  } catch {
-    pk = null;
-  }
-  if (!pk || !/^0x[0-9a-fA-F]{64}$/.test(pk)) {
-    pk = generatePrivateKey();
-    try {
-      window.localStorage.setItem(KEY_STORAGE, pk);
-    } catch {
-      /* Ephemeral key: scores just will not persist across reloads. */
-    }
-  }
-  return { address: privateKeyToAccount(pk).address, pk };
-}
-
-export async function fetchBoard(): Promise<BoardEntry[]> {
-  const raw = (await pub().readContract({
-    address: SCORES_ADDRESS,
-    abi: artifact.abi,
-    functionName: 'top',
-  })) as readonly { player: Address; score: bigint }[];
-  return parseBoard(raw);
-}
-
-export async function fetchBest(address: Address): Promise<number> {
-  const raw = (await pub().readContract({
-    address: SCORES_ADDRESS,
-    abi: artifact.abi,
-    functionName: 'best',
-    args: [address],
-  })) as bigint;
-  return Number(raw);
-}
-
-/**
- * Submit a score from the browser's throwaway wallet. Funds it from the
- * faucet on first use. Resolves to the tx hash once mined.
- */
-export async function submitScore(score: number, onStatus?: (s: 'funding' | 'submitting' | 'confirming') => void): Promise<Hex> {
-  const { pk } = scoreWallet();
-  const account = privateKeyToAccount(pk);
-  const client = pub();
-  if ((await client.getBalance({ address: account.address })) === 0n) {
-    onStatus?.('funding');
-    await vibenetApi.faucet.drip({ address: account.address });
-    const until = Date.now() + 20_000;
-    while ((await client.getBalance({ address: account.address })) === 0n) {
-      if (Date.now() > until) throw new Error('The faucet did not fund the score wallet in time.');
-      await new Promise((r) => setTimeout(r, 500));
-    }
-  }
-  onStatus?.('submitting');
-  const wallet = createWalletClient({ account, chain, transport: http(VIBENET_RPC_URL) });
-  const hash = await wallet.writeContract({
-    address: SCORES_ADDRESS,
-    abi: artifact.abi,
-    functionName: 'submit',
-    args: [BigInt(score)],
-  });
-  onStatus?.('confirming');
-  // Replacement detection would cost an extra round trip per poll; a fresh
-  // throwaway key never replaces anything.
-  await client.waitForTransactionReceipt({ hash, pollingInterval: 200, timeout: 30_000, checkReplacement: false });
-  return hash;
-}