Bubble Bust freeIt may not be much to look at with its retro feel, but gameplay is more than skin deep. This simple-looking game is a level-based ‘bubble-shooter’ where the goal is to clear the marbles by making groups of three or more of the same colour before the marbles reach the line at the bottom. It takes a couple of levels to get used to, but there’s over 70 increasingly difficult levels to explore.

Worth a try when it’s currently available for free from iTunes here.