1121 comes from Ming-Shiuan Yu.  The object is to slide the tiles until they hit a wall and hopefully end up with a true sentence like 2 > 1. When that happens, the tiles disappear.
1. Arrows force the direction of tiles. 2.  Exclamation Points: landing on them is permanent.

There are 150 levels and I've done 26 levels.

Solid game overall.
https://itunes.apple.com/us/app/1121/id1400669212"mt=8

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