Zero21 Solitaire by CoPilot Games FREE

Zero21 Solitaire comes from CoPilot Games. It's a solitaire game where the objective is to get through the entire deck without Your Green Pile going over 20 or under 1.

This game takes about 5 seconds to learn.  Some cards have arrows.  An up arrow zooms your Green Pile to 20. Down arrows plummets it to 1.  The card with two arrows will send you to the midpoint, 10.
I've solved about 35 levels.  Fun & fast.  But ultimately, not a keeper.  I do like the graphics a lot.  And each level has a different configuration of card piles.
https://itunes.apple.com/us/app/zero21-solitaire/id1448993473?mt=8