Hemisphere Games has released a big update to the great indie game Osmos that adds in a new multiplayer mode. You can face off against a friend on another device and enter an arena where both players need to consume variously sized orbs around them, each one vying to become bigger than the other and consume the opponent. There are six different arenas to play in, which each add a different set of elements to the gameplay. It's not a huge update, but if you and your friends really love Osmos, it seems like a fun way to face off.
Osmos is currently available for $2.99 on the iPhone and $4.99 on the iPad.
