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#25: Portal (Valve, 2007) - PC (also on PS3 and Xbox 360)

It's funny how this seemed like an intruder on The Orange Box. Just a small, brand new ip. And yet, it proved the best game on that package. What's most impressive about Portal, is that the game is just one giant tutorial. The game just stops giving you instructions near the end, but nobody notices that because it's so well designed and addictive. The Portal mechanic is one of those "how did nobody think of this before?", and this and the sequel are actually the only puzzle games that don't bore me. It's one of the games with the highest replay value to me. Plus, GLaDOS is awesome.