It's a Gtk version of the game Sokoban I altered to fit on the screen in portrait mode. I scaled down the tiles from KSokoban so you get to push around those big red gems, but the original tiles are included in the source package. I also bound the middle button (return) to undo and added a lot of history space. I also made another version with bigger tiles, scrollbars and David Skinner's Sasquatch IV levels, but I seem to have misplaced the source so there's only a binary package now.