We have started a list of Single iPad Co-Op Games. These games come in handy when you only have one iPad around and wish to play games in co-op mode. Several of the games are party games such as Bop It! for Ipad, Fingle, and Slice HD. Many others are board games, including Forbidden Island, Scotland Yard, and Operation: Eradicate.
Puzzlejuice is a hybrid word and puzzle game. Multicolored blocks constantly fall from the top of the screen, and it’s up to you to arrange them. Once you complete a row with these blocks they will turn into letters. The only way to clear out these blocks is to spell words. You can also match colors—that will make letters too.
There is no separate, dedicated co-op mode in Puzzlejuice. However, two players can split responsibilities in a single-player game, with one player handling the blocks, and with the other player making words. This works well on an iPad, but it is impractical on the smaller screen of an iPhone or an iPod touch.
Here is video of two people playing Puzzlejuice cooperatively on an iPad: http://www.youtube.com/watch?v=ezpFkdQUGEo
iTunes page $1.99