Skin said:
I don't play it, but EVE seems to take the cake.
Every article I read on that game on Cracked just leaves me awe-inspired.
Yeah Eve online certainly springs to my mind, when it first came out in 2003 it was pretty much sandbox with only a bucket and spade in it. However it since then it has had a great deal of content added into it. Then theres the meta game, the scams and power struggles everyone hears about. The makers CCP seem to be very forward thinking in how they make their games, just look at the upcoming Dust on PS3, sure its a online FPS, however it's tied directly into Eve.
I'ld put Minecraft in a similar bracket as Eve.
Shoot-mania is also an ambitious game too. it's been built from the ground up as a competitive team based FPS with unique gameplay modes inc 3 vs 1. Also like Track-mania the devs are giving the tools to easily create their own maps. I watched a tournament on Totalbiscuit's channel and it's quite fun to watch.
also Splunky XBLA
Also i'ld rate this as ambitious considering there's only one guy behind it
His previous game Noitu Love 2 is only £1.99 on steam atm and well worth it.
Recettear is a unique game so is the upcoming territoire