Eon Commando 2.5.0 — replays and daily runs

Replays and a daily run — both local, both offline.

The simulation is deterministic: same seed plus same inputs produces the same run, exactly. So a replay doesn't record game state at all — just the seed and the input stream.

Replays

R on the title replays your last run, with a REPLAY watermark.

900 frames of play compress to 196 characters of run-length-encoded text in localStorage, because input is mostly static frame to frame. Verified rather than assumed:

recorded  score 1380 · x 861 · 210 · 1 · 8 · era 0 · lives 2
replayed  score 1380 · x 861 · 210 · 1 · 8 · era 0 · lives 2   MATCH: YES

That's the whole run reproduced frame for frame from 196 characters.

Daily run

D on the title seeds a run from today's local date, so everyone playing today gets the same run. No server, no clock sync, no leaderboard — just the date hashed into a seed. Today it's 834542573, labelled 1/11 on the title screen.

Why this was only possible now

Replays need determinism, which needed the seeded sim/fx RNG split from 2.3 and the cosmetic-randomness fix that came with it. Without those, a replay would drift within seconds. This is the payoff for that unglamorous work.

Numbers

Game	index.html — 162 KB, single file
Gzipped	44 KB
Replay size	196 chars for 900 frames
Playback fidelity	Exact
Dependencies	0

Full notes in CHANGELOG.md.