from what i hear, the 2nd is where the series really picked up. 3rd was censored badly, 4th i forget if it got censored a bit or not at all, but it was fine.
got 1 and 2 on the backlog.
4 was the first PS3 game i got because it was $10 and i figured if i was gonna get the system eventually, 4's a good backlog to have.
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"Maybe it's a tentacle, molesting the planet itself. - Aschen Brodel.