There are six different arenas to battle in, and the multiplayer mode supports play between iPad and iPhone versions of the game. The multiplayer mode in Osmos lets you play against your buddies locally over Wi-Fi, or against strangers online.

Odyssey mode sees you tackle a series of 72 levels within the Osmos 'Blobisphere', while Arcade mode lets you play any level at your choice of difficulty (this needs to be unlocked in Odyssey mode first). There are three game modes in Osmos - Odyssey, Arcade and Multiplayer. In-game instructions are excellent, and all the controls work perfectly. Osmos has been excellently transferred to the iPhone's small screen. It's extremely absorbing and really easy to get totally lost in the gameplay. This unusual action is accompanied by really beautiful minimal graphics and ambient music. There is a variety of other motes to deal with, like repellers and attractors, which make Osmos more interesting, but never frantic. You therefore have to move gently around, aiming to drift into the right motes, and do nothing suddenly. The trouble is, you move by expelling matter, which shrinks you. Your challenge, generally, is to absorb smaller motes, and grow enough so you are the biggest.

In Osmos, you control a 'mote', which can absorb other smaller motes to grow.

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