-Ads are intrusive, forcing you to watch ads for undo actions. -Forces you to spend 4$ for local multiplayer. No online multiplayer. -No AI difficulty, and the AI quality isn't very good. -To it's credit, the game is a novel and fun idea; try not to think of this game as competitive, but rather as a casual version of chess just for giggles & fun. -If the developer would relegate ads to just appearing on banners instead of taking away undo actions, this game would be much better.