Endless flyer Mad Aces proves amazingly addictive despite the simplicity of its design. As your character – selected from an expanding roster of Aces as you unlock them – heads towards the right of the screen, you move them up or down to any of three vertical positions to avoid the hazards ahead. While you can just smash through stone blocks without harm, hitting spikes results in instant death. To help you out of a tight spot – if you’ve flown into a deadly dead end, say – collected fireballs can be used to blast through hazards. Although extra characters can be bought with real cash, the IAPs are purely optional and the game is littered with collectable coins, as well as awarding you free gifts every so often – plus 20 coins from watching video ads. With its cute Crossy Road-style visuals and that just-one-more-go factor, Mad Aces is well worth a test flight.