On the surface Rules!! appears to be a cutesy child's game but is in fact an exercise in improving concentration and recall. Tapping brightly coloured tiles displaying unicorns, robots and monsters, the objective is to follow the rules in order, which gets increasingly tricky as each new level adds another rule. It certainly clears out the holiday cobwebs: the first time I played I struggled to level eleven and on the second go I limped to 29. You can almost hear the gears in your brain grinding as you try to recall each rule so it certainly feels like a mental workout.

I've seen blogs that provide a cheatsheet or suggest you write down the rules as you go along but that's a bit like Googling during a pub quiz; you might win but you've achieved nothing. https://itunes.apple.com/us/app/ rules!/id840811083?mt=8