RiverCrossingDS by MangledLftThumb sees an update. Aim of the game is to cross a river which might turn out tricky.

Changes:

[March 30, 2007] – v0.32
Added logic to track puzzle status (i.e. now, adds “- completed.” beside puzzle number once you’ve managed to get hiker to other side of the river).
Added support to read/write libfat file to store puzzle status. “RiverCrossingDS.txt” should be in root directory. Use X to update status – file is automatically read when you press START. Works great for me on a GBAMP!!

http://palib.info/forum/modules/newbb/viewtopic.php?viewmode=flat&type=&topic_id=2492&forum=9