[BeFlatXIII]

The one with the stairs could've been ripped straight from the original Half-Life. Makes me want to play it again. Thank you for the reminder.

[lupusreal]

My first thought was Akira, but it's almost the same thing; there are some parts of Half Life which are lifted almost directly from Akira, like the first diagonal elevator that headcrabs slide down.

[progman32]

Dead ringer for the underground sections of Mirror's Edge.