STP: Solitaire is about as classic as games get. It’s simple: all you need is a deck of cards and some time. You sit with the cards laid out in front of you, patiently ordering your stacks and revealing new cards that you may or may not be able to play immediately. Should you win, your reward is nothing but the satisfaction that comes from finishing the game. Solitaire by Backflip takes this classic card game and juices it full of rewards and micro-transactions, feeding off the freemium craze.