I made some minor changes to gui_tetris.c
- Highest score is saved to A/CHDK/GAMES/TETRIS.SCO
- Backlight is switched off when you pause
- Changed the keys - KEY_SET to rotate, KEY_UP to pause
gui_tetris.c attached. I only tested it with CHKDK-DE and an ixus220_elph300hs. I don't have much experience with C or CHDK, so my code can definitely be improved but it works for me.
http://pastebin.com/deSabSLn
