These games that include co-op play appear on the iPad Top 100 Paid Apps list on April 29, 2012:
#4 
Draw Something
#12 Minecraft – Pocket Edition
#14 Garage Band
#78 Call of Duty: Black Ops Zombies
#91 Sky Gamblers: Air Supremacy
Sometimes a great gaming app is released with only single player and/or competitive multiplayer modes. Then after awhile, with a little more time and money at its disposal, the developer releases a co-op mode update. This has happened with other titles in the past, including Flight Control and Tilt to Live. On April 12, co-op updates were released for two more games:
Call of Mini: Zombies
Dungeon Hunter 3
Tilt to Live is a polished arcade game that has a great co-op mode.
We have been playing Tilt to Live for over a year. We finally decided to get the 99-cent in-app purchase to try the co-op mode. After 10 minutes of playing Tilt to Live, it was clear to us that the co-op mode is the best we’ve played to date for any iOS game.
Why is the co-op mode so great?
1. Great matchmaking: it allows for local wi-fi or bluetooth co-op multiplayer sessions. However, you don’t have to choose the wireless protocol. The game first tries wi-fi, and then if it can’t find a connection, it tries bluetooth, all behind the scenes.
2. Easy-to-understand gameplay: After 2 or 3 short games, we figured out what we needed to do. Tilt to Live co-op mode, entitled Viva la Turret, is all about getting a high score. Either player bumps into an orange circle and mans an automatic gun, while the other player picks up the shards that appear after the bad red dots have been shot. The more shards picked up, the higher the multiplier, and thus, the higher the score.
3. Great for short gameplay sessions: Most of our games lasted 30 to 60 seconds. So it’s easy to get quality co-op gaming in during short bursts, like 5 to 10 minutes at a time. On the other hand, the co-op mode is so fun, we’ve spent over 30 minutes in a row playing it.
4. Gamecenter leaderboard for co-op high score.
We tried the iPad version, Tilt to Live HD, but we preferred the iPhone version, because you don’t have to move your hands around as much to move your ship around.
So for now, Tilt to Live goes straight to the top of the coopmode.com Ranking of iOS Co-Op Games.
Tilt to Live $2.99 and then $0.99 for the in-app purchase that includes co-op mode
Tilt to Live HD free and then $4.99 for the in-app purchase that includes co-op mode
We’ve started rankings of the most fun to least fun iOS co-op games we’ve played, and we’ll keep adding games to this page over time.
We’ve started a big list of iOS co-op games, and we’ll keep adding games to this page over time.
Blokus™ is the award-winning hit board game from Mattel. Block your opponents so they cannot add any more blocks on the board. The player or team with the most blocks on the board wins.
Two players can play in co-op mode as a team against two computer opponents. Blokus supports local multiplayer via Bluetooth and wi-fi and online multiplayer via wi-fi and 3G. While the single-player mode of Blokus allows you to change the difficulty of the computer opponents, the multiplayer modes of Blokus does not allow you to change the difficulty. The built-in difficulty of the computer opponents in the co-op mode is easy-to-medium difficulty.
Blokus is available for iPhone and iPod Touch, and Blokus HD is available for iPad. Conveniently, a player on the iPhone version of Blokus can play co-op games with a player with Blokus HD for iPad.
Blokus iTunes page $0.99
Blokus HD iTunes page $2.99
These games that include co-op play appear on the iPhone Top 100 Paid Apps list on April 1, 2011:
#2. Draw Something $0.99 iTunes page
#29. Minecraft Pocket Edition $6.99 iTunes page
#62. Call of Duty: Black Ops Zombies $6.99 iTunes page
#67. Zombieville USA 2 $0.99 iTunes page
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
Zombieville USA 2 is a fun zombie shooter that allows for 2-player co-op via Gamecenter or Bluetooth. You can partner with a friend to blast through levels full of zombies. Whether you play alone or with a friend, you earn cash that you can apply toward different characters, weapons, and upgrades.
Zombieville USA 2 co-op mode is fun whether you have 5 minutes or an hour to kill.
iTunes page $0.99