[soheimam]

Summary

Adds a Share on X button to the Base Runner (/vibenet/demos/200) game-over overlay. It shows after any run that scored above 0. Clicking it opens X's post composer (x.com/intent/post) with one of two lines, picked at random on each game over:

I ate [XX] blocks on Base Runner

How long can you survive? https://chain.base.org/vibenet/demos/200

I survived [XX] blocks on Base Runner

See how long you can last: https://chain.base.org/vibenet/demos/200

Both use the run's score (blocks eaten). The game doesn't count blocks survived separately.

• app/vibenet/demos/200/lib/share.ts: share copy, X intent URL, random line pick.
• BlockRunner.tsx: the game-over overlay now always shows when the score is above 0. The "Post N onchain" prompt keeps its old conditions and sits next to the share button.
• Block Runner page copy now says Denim mints a block every 200 ms (it said Cobalt). 200 ms blocks and millisecond timestamps ship in Denim; the game's code comments are updated to match.
• New analytics helper trackBlockRunnerShare(variant, score) (block_runner_share event), listed in AGENTS.md.

Harder runs

Before this change, self-play bots never died in 10 minutes (~950+ blocks): the difficulty curve flattened after about a minute. Now:

• Speed keeps rising past 60 blocks (+0.8 px/s per block, up to +240; top speed 960 px/s, was 720), and walls keep getting taller and wider up to ~300 blocks.
• A heart takes 25 bites to come back (was 12).
• FULL lasts 1.5 s (was 2.5 s), and each FULL needs 25% more food than the last.
• Chewing slows as the belly fills, phased in over the first 240 blocks, so a wall right after a bite on a full belly costs a heart.
• Each block gets a stable random height nudge (±20 px) seeded from its block number, so quiet stretches of the chain no longer look like rows of identical walls. Spawn timing is untouched: still exactly one block per 200 ms.

Self-play bots (perfect tapper, every-frame masher, ~7 taps/s with jitter) now average ~50 s per run, best ~160–180 blocks. The onchain leaderboard is unchanged, so existing high scores stay on top.

Screenshots

Game-over overlay at 1280×800 (forced to a 42-block game over through the dev-only __blockRunner hook):

Clicking Share on X opened https://x.com/intent/post?text=I ate 42 blocks on Base Runner… (checked with Playwright).

Test plan

• npx vitest run app/vibenet/demos/200: 50/50 pass, including new tests for the late ramp, chew time, FULL cost, block salt, and a self-play check that perfect tapping dies within 30–120 s.

• Played locally on next dev.

• npx vitest run app/vibenet/demos/200: 43/43 pass, including new lib/share.test.ts (exact copy for both lines, URL round-trip, random pick mapping).

• Playwright against next dev: forced a game over, captured the overlay, clicked Share on X and checked the popup URL text.

• npx eslint app/vibenet/demos/200 app/analytics/events.ts: clean.

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Project	Deployment	Actions	Updated
omni-ui	Ready	Preview	Nov 9, 2026 1:11pm UTC

[cb-heimdall]

✅ Heimdall Review Status

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