Fixes in the new builds:
Excessive flashing when redrawing has been eliminated.
A tunnel bug causing tunnels to behave like black holes when they shouldn't be has been fixed.
Support for recording and replaying solutions has been added.
Support for undoing and redoing moves in the game has been added.
The dialog that displays when you die now offers 3 options: Undo, Restart, or End. Undo undoes the last move. Restart resets the level to its unsolved state. End quits the game, sending you back to the main screen.