[Game] Touch Square is possibly most simple, but addicting on market (Post Scores!)
 

Touch Square is a new game where you have to tap to eliminate squares before they grow too big and touch the borderlines. Tapping circles will end the game immediately...

Gameplay Video: YouTube - Android Game: Touch Square Pro & Free Versions

It's oddly really fun for how simple it is... and don't knock it till you try it! I was skeptical at first, but this may be my go to "waiting room" game for a while.

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