Crystals is my first NDS Homebrew game and is based on an old board game called Black Box.
The basic premise is that you shoot rays into the game board and based on their behavior, you are able to locate hidden crystals. A ray can HIT the crystal, be REFLECTED back the way it came in or be DEFLECTED out another way. The rules are a little tricky to catch on to at first but after you get the hang of it, the game is very addictive. Refer to this Wikipedia Site Wikipedia site for an excellent description of the rules.
The game is fully playable now and I have the following to finish up in future versions....
-Better graphics (this version has just enough to get the main game engine going)
-Options (Number of hidden crystals, timed mode vs. standard mode, etc)
-On board rules and help
-Save game and statistics
I have tested it on an M3CF and a G6Lite with no problems.
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Please give it a try, and let me know if you have any questions, comments, bug reports, etc.