Platforms: PS3, Xbox 360, PC, Mac, & Linux
No, you did not misread that; I wrote Portal. Toward the end of the original Darksiders, you unlock a portal gun. Sadly, this portal gun can only be used on very specific pads, which greatly diminishes its ability to emulate the awesome physics bending powers shown off in the Portal games.
Their attempts to rip off Portal were even more transparent than their attempts to rip off God of War and Legend of Zelda. While they succeeded in replicating the other two series, they were not able to bring any of the thrills of Portal by merely giving you a knock-off portal gun for one late-game dungeon.
That being said, the puzzles that used the portal gun in the original Darksiders weren’t bad, so that’s a caveat at least.