It’s a great week for iPhone games. First, a Rolando update delivers five bonus levels. Second, there’s Eliss, a geometric arcade game with retro style. The graphics, sound and controls are just right. The rules are simple—join or split coloured discs so they fit the targets, and don’t let different colours touch—but you’ll need to use both hands to keep on top of the action. It’s hard, but very addictive: definitely worth five bucks.