Nice take on solitaire, but becomes a pay to play game as you progress. The in game currency is coins and you need to spend a certain amount to play each level. hen you win you typically make a bit more than you spent. The problem is there are times where you don't even break even if you win and some of the levels are unwinnable without attempting the level several times. Very similar to other mobile games, they slowly whittle your in game currency down until you quit or spend $$$.