Spore
 

really great game - quite a unique game really

basically you start off as a single cell and then depending on the choices you make it determines what options you have available to you in your next stage of evolution

then you can share your creatures online so other players will see them featured there

Re: Spore
 

I enjoyed spore but found the playability wasn't long. Once you get to the space stage, going through it again becomes tiresome as most of the time you are either hitting your enemy or making friends with them.