I0O - two intro levels
These levels teach you how to play Osmos.
I0O1-Move to the Blue circle
This level is a tutorial how to move.
I0O2-Absorb the Targets
There are three targets. One can only be eaten after eating one of the other two, and is about twice as big as you. The other two are just small enought not to have any red in them and just large enought so that absorbing one allows you to absorb the big one.