Ncmoco's Rolando is a game with a hidden agenda. It doesn't just want to, y'know, entertain you. It also wants to teach you stuff — physics, in particular:
Multi-Touch controls to guide the Rolandos through four
visually-distinct worlds and 36 engaging levels. Solve physics puzzles,
toy with the interactive environments and evade pesky enemies as you
lead the Rolandos to victory.
In other words, it's a cheery, colorful platform adventure with a kid-safe "4+" rating. Of course, the danger here is that, if you actually give your iPhone to a 4-year-old with this game on it, Junior'll likely run down the battery without making a single call.
[US$9.99 at iTunes]