Snake. But your tail doesn't follow you. It turns to stone where you left it.
Five pixels and an apple. Eat, grow, don't crash. You played it under a desk, on a phone with no colour and a battery that lasted a week.
Same three seconds to learn. One rule changed and everything after it is new.
Hunger changes your body. The head takes the food and you lengthen. 3 cells long right now and every one of them is a wall you haven't built yet.
Every snake drags its tail. Yours doesn't. Shed and it stops where it stands and hardens. It is there in ten seconds. It is there in three minutes.
Every run ends. The stone stays. Run 3 on this board, 0 stones so far, every one of them somewhere you chose to go.
Boxed in by your own past, catch the rhino and drive into your own stone. It cuts to glass. 1 panes here: a floor you can cross forever and never build on again.
Stay long for points. Or shed now and live. One resource: you eat it to score, shed it to build and it buries you either way. 60% of this board is still open. It will not stay that way.
Fortress complete. 74% buried in 12 runs. Everywhere you've been is in your way. This is specimen 88, yours alone.
Everything here is set in stone. The runs you played, the walls you left and now you. The front door keeps one stone for everyone who ever came in and yours is lit. A finished fortress was never the end. It is everything you built, still standing.