Moonlights ($1.99) is a brilliantly-made tower physics puzzle. The object is to build towers based on available nodes that point to the moonlights and that stay there for at least three seconds without toppling over. Sometimes you may have to delete existing nodes; other times, you may have to work with gravity, tilting your screen to ensure that you reach your goal.
If you’re uncertain, there are often demos for beginner levels to help you get on your way, but note: these are hints and cheats, and you only should try a demo if you’re really stuck! Demos also help you understand the goals of the game, so if you’re brand new to the experience, they’ll help you get on your way.
Moonlights boasts 91 extensive levels (and I’m sure there will be more), making this a fun game for a long time. The iPhone/iPod touch is a fantastic platform for this game, and it runs perfectly. You’ll have a ton of tun playing Moonlights; it’s one of those games that is simple, yet complex, and is clearly addictive.