2048

Slide tiles with the direction buttons; equal tiles merge and the score grows. A new 2 (or occasionally 4) appears after every move that changes the board. The game ends when the grid is full with no equal neighbours.

Controls

Button	Action
Up / Down / Left / Right	Slide the board
Confirm	New game
Back	Exit

Notes

The best score is kept in /.apps/2048/best.txt and written on game over, new game, and exit.
Tile shade tracks magnitude (white → light gray → dark gray → black), which is the one place the panel renders true grayscale via gui.fillRoundedRect.
Every move repaints the whole grid with REFRESH_FAST; the panel diffs frames, so only changed tiles actually move.

Testing

Logic runs off-device with stubbed firmware globals:

nix run nixpkgs#lua -- _scratch/test_2048.lua