The game was really solid on consoles, but don't forget that there was a portable version, too. If you want to take your quest on the go, try the PSP iteration, which is great with a buddy.
Unlockable
By completing the game once, you unlock the Tesla Cannon and the Spreadgun.
There are also four secret characters to unlock; here's how to get 'em:
| Dante | Finish the game by always making morally-bad choices |
| Isaac Clarke | Finish the game by always making morally-good choices |
| Jonah | Finish the game once on any mode |
| SMILEY | Finish the game once on any mode |