Good, but the ads spoil some of the experience. The ad UI is horrible, if you tab out the ad restarts from the beginning, if you tap your phone's back button nothing happens, there are minute ads that sometimes won't let you skip them, and the 'x' for ads (in horizontal mode) are hidden behind your buttons. It's a fun game, but because you lose a lot you typically run through lots of ads. The incentive ads are a joke, tokens are terrible if the game randomly chooses where they're invested.