Cheats Codes Guides
- Includes cheats and unlockables.
- http://www.cheatscodesguides.com/playstation-portable-cheats/konami-psp-title-1/

GameSpy PSP
- Review, by Raymond M. Padilla: "At best, Acid is a really fun time for a very small percentage of gamers. At worst, it's a good game that a lot of people will find boring." [Score: 3.5 out of 5]
- http://ps2.gamespy.com/playstation-portable/konami-psp-title-1/601336p1.html

Gaming Target
- Preview, by Chris Reiter: "Whether this succeeds or flops here in America, one thing is still for certain. Metal Gear Acid has the attention of PSP onlookers, and Konami wants to keep it that way."
- http://www.gamingtarget.com/article.php?artid=3900

IGN PSP
- Preview, by Nix: "Japanese audiences have cautiously opened up to this bold Metal Gear experiment for some encouraging sales results that have grown as more of the sought-after PSPs reach the market."
- http://psp.ign.com/articles/583/583313p1.html

HonestGamers
- Review, by midwinter: "The majority of games simply aren't this good. It stands aside from the crowd and you'd be crazy to miss it." [Score: 9 out of 10]
- http://www.honestgamers.com/systems/content.php?console_id=53&review_id=3169

GameFAQs
- Offers information, FAQs, cheats, reviews, and a message board.
- http://www.gamefaqs.com/portable/psp/data/920776.html

GameSpot
- Information, news, previews, cheats, movies, screenshots, and box art.
- http://www.gamespot.com/psp/strategy/metalgearsolid/