Flood-It is actually made by the same people as Line-Up and is more of a brain puzzle. You start with a cube filled with different colored blocks. Beginning with the top-left corner, you switch the color of the blocks to try and make the whole cube one solid color. Again, they love their catches, you have to complete the transformation in 22 moves. Although quite addicting, this game can get frustrating when you lose like 15 times in a row.
That's right folks, Katamari has come to the iPhone! While the full game does cost money, the Lite version is available for free. Not much explaining needed...the Tiny Prince is at it again, rolling up everything in sight. However, even though there isn't much complexity to Katamari anyways, the Lite version only allows you to explore 1 level...so playing it's not really a game that I'd like to sit and play over and over.
Word puzzles at their finest right here. Not only is this game free, but it also allows you to play online with other players! It's literally a word scramble. You are provided with a series of letters, and you are allotted a specific amount of time to solve the puzzle (which hopefully takes less time than the people you're playing). It's really fun, and also keeps you on your toes (or on your fingers? idk.).
Critter Crunch Lite
Oh. My. Tasty Critter Goodness. This game takes everything horrible about a Lite game and completely abolishes it. For real. While Katamari Lite was fun until you reached the cap....Critter-Crunch Lite has no foreseeable cap on the game, and as you keep playing it unlocks different play-modes. AND I saw on Kotaku the other day that they are also releasing this game for the PS3! I am really excited about it, and also quite happy that a game has finally come along and broken the mold for Lite games.