Cheats Codes Guides
- Provides a list of cheats and unlockables.
- http://www.cheatscodesguides.com/playstation-portable-cheats/twisted-metal-psp/

GamingMoz
- Information, release dates, box art, and cheats.
- http://www.gamingmoz.org/games/g408/playstation-portable/twisted-metal-head-on/

PSX Extreme
- Review, by Arnold Katayev: "It'll keep you entertained for hours and hours, and the multiplayer capabilities truly are an absolute blast." [Score: 8.8 out of 10]
- http://www.psxextreme.com/scripts/reviews3/review.asp?RevID=6

GamePro
- Review, by Four-Eyed Dragon: "It's even great for just a quick fix of brainless destructiveness by yourself."
- http://www.gamepro.com/sony/psp/games/reviews/42874.shtml

GameSpot
- Review, by Greg Kasavin: "...if you like the premise of a bunch of crazy vehicles trying to blast each other to kingdom come, you'll be more than satisfied with the execution." [Score: 8.5 out of 10]
- http://www.gamespot.com/psp/driving/twistedmetal/review.html

GameFAQs
- Data, cheats, reviews, and a message board.
- http://www.gamefaqs.com/portable/psp/data/920793.html

GameSpy PSP
- Review, by Bryn Williams: "While Twisted Metal: Head-On isn't the most original, best-looking, or best-sounding game for the PSP, it's one of the most enjoyable in the gameplay stakes." [Score: 4 out of 5]
- http://ps2.gamespy.com/playstation-portable/twisted-metal-psp/598284p1.html