[GolfyMcG]

If it wasn't so late I might get into it but I think this could be dramatically improved by just detecting whether a piece is currently underneath another piece. Assuming you can eliminate those as possible choices for the random select process, you would avoid the issue of iterating through a bunch of pieces that can't even be moved during the late game!

[codybits]

Yeah, that would probably help a lot. It is pretty dumb in its current state. That said, sometimes it can join matching tiles that are next to each other in the bottom of the pile, so that can still be useful.

Maybe I'll work on it some later...