Alter: Between Two Worlds
Brains meet beauty
ALEX BLAKE
£2.99 FROM Crescent Moon Games, crescentmoongames.comNEEDS iOS 9 or later
Later levels feature shifting platforms and deadly enemies.
There are plenty of beautiful puzzle games, but not all are as challenging as Alter. Each level comprises two worlds, which you can switch between when you stand on portal tiles. The trick is to manipulate your surroundings in one world so that you can reach the goal in the other.