Colorcube £1.49

Deceptively tricky puzzles are the name of the game in Colorcube. Twist and turn shapes so that their colours blend to match the objective given at the top of the screen. It starts off simple but rapidly becomes fiendishly difficult. It looks gorgeous, too.

Why you need it: Combines puzzle fun with lovely design.

What’s it best for: Brain teasers for the daily commute.