#4 - LittleBigPlanet (Kudos to Brendude for guessing this)
LittleBigPlanet was actually one of the first game I picked up for my PS3 in 2010 when I started gaming again on consoles after a long absence. It turned out to be (along with my #3 game) the catalyst to get me back into console gaming on the whole and a shining example of brilliance on the PS3.
There's not much I can really say about LBP that people here won't already know. It's a 2D platformer where you can create your own levels. Yes, if you can't handle that you may never be able to enjoy the game. No, it didn't impact my enjoyment of the game in the slightest.
Even though I think, objectively, LBP2 is a much better game (and LBP Vita is better still) all my fondest memories are contained in LBP 1. Even little touches such as the intro were unlike anything I'd seen before; Stephen Fry's weird narration over some beautiful imagery. Staying up all night playing online with my friends in London who I hadn't seen for 2 years because we had all gone to different Universities. Progressing through the campaigns together before going to some incredibly designed community levels. Trying our hand at making our own level and utterly failing because things were far too complicated for us to understand; so going back to play some more brilliant community levels.
Seriously, even in the first game which is incredibly limited in terms of what you can create compared to subsequent titles, the community did an absolutely excellent job. I played Tomb Raider knockoffs; War of the Worlds; Motorstorm; rollercoasters and all sorts. Such a brilliant, brilliant title.
Oh, and I miss when this was the music that played in the pod. Wish you could choose it as an option for the later games:
