Margins for error are minuscule in this puzzler, so victory is truly sweet when your perfect shot completes yet another wonderfully devious level. Between the elegant monochrome design and satisfying physics-based gameplay, Okay is an impressive workout for the mind.

What we love: Swiping to launch your ball across the screen, then watching it obliterate every white block it collides with. The ease with which the ball ricochets – sometimes to oblivion beyond the screen’s edge – makes Okay all the more rewarding when you get it right.

Quick tip: The order you do things is in is crucial. Aiming your first shot at a small, stationary object is much easier than hitting a tiny target after your ball has bounced across multiple moving objects.

Meet the creator: Indie developer Philipp Stollenmayer is based in Riedstadt, Germany and has handcrafted several apps and games, including the award-winning Song of Bloom.