Splinter Cell: Double Agent for Xbox 360.
Man.

Back when this game first came out, the reviews basically said, "Xbox normal version is better, ignore the Xbox 360 version." They criticized the levels in which you played as a double agent within the terrorist's cell, arguing the more traditional approach of Splinter Cell: DA for Xbox worked better. So I grabbed the Xbox one and just played it.

I finally decided to go back and try the Xbox 360 one.

Holy balls. The critics were wrong.

The levels where you're inside the base are what make the game, not what wreck it. They're tense as hell, with infinitely greater chance of discovery and hair-line chances of success. They're fantastically well designed.

OK, let me pull back. The basic premise of Double Agent is, as the title suggests, that you're a double agent within a domestic terrorist organisation named John Brown's Army. You worm your way in by breaking one of their members out of prison, and then the game alternates between your missions for them, and your time at their base. When in the base, you're meant to be training, but you can use this time to complete missions for the NSA, swiftly placing tracking bugs, software backdoors into their data servers, etc. It's unrealistic sure (would a hard-core terrorist cell REALLY run their own data servers?), but it's FUN unrealistic spy stuff. You walk around, smiling and nodding to the other cell members in the zones you're allowed in, and then duck into a side corridor, sneak into restricted zones you're not meant to be in, and accomplish tasks that you're not meant to be doing.

Fantastic. This is great stuff, it feels atmospheric and right. It's a great game.