Test Chamber: puzzle app for ipad, iphone

A lot of folks have been talking about Test Chamber. It appears to be a sokoban type puzzle. But it's much more.

The goal is to push the cube into the blue hole.

First of all, each level has a unique AHA element. There's also the very cool wrap-around world, which at first seems unnecessary.

I'm stuck on level 17. Without a doubt, Test Chamber is in the running for a PAGY Nomination. Check back on December 30.
https://itunes.apple.com/us/app/test-chamber-mind-bending/id955684188?mt=8