Dustline
Your tyre tracks stay in the dust. The line you pack on lap one is grip by lap two and a rut by lap five — and a rut is the fastest thing on the course, if you meant to be in it.
Every wheel you put down leaves a track in the dust, and the dust keeps it: a line you have driven once packs into grip, and a line you have driven five times becomes a rut.
A rut is the fastest surface on the circuit in a straight line, and it fights you the moment you try to leave it. So the racing line you lay on lap one is the line you are stuck with by lap five, and the race is a bet you place early — pull the handbrake through a corner while the dust is still loose and pack it three cells at a time, then decide, somewhere around lap three, whether to keep the line you built or cut fresh and pay for it now.
How it plays
- One closed circuit per seed; this one is 20260810. Five laps, par 2:18. Wear never decays inside a race, so nothing you do to the ground gets undone.
- The ground is a 4 px grid and every cell counts your crossings. Loose dust gives 0.55 grip, packed 1.00, worn 0.85, and a rut 1.10 along its own direction against a 0.35 steering coefficient — floored in code, so a rut leaves you 58 % of your turn rate rather than none of it. Measured: a rut runs 369.2 px/s where packed runs 335.6, and the same corner turns your velocity 28.4° instead of 49.3°.
- A scripted test driver that lays one line and reuses it finishes in 126.70 s. The same driver cutting fresh dust every lap takes 144.17 s. Par sits at 138 s, between the two, deliberately.
- Shift is the handbrake: lateral grip collapses to 0.20, the tyres let go, and the slide lays a track three cells wide instead of one. It is how you pack a whole corner in a single pass, and it is the way out of a rut you no longer want.
- Off the course there is no respawn and no reset — grip 0.40 and a top speed of 84.3 px/s. Five checkpoints per lap mean a corner you cut is a corner that does not count.
- Two colours, a 4×4 dither, 480×270 integer-scaled, and darkness means grip: mean screen luminance moves from 0.698 on bare dust to 0.434 on a fully rutted course, so lap five does not look like lap one.
Nothing on screen is a colour. The track is the drawing you made on it.
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