GameZone
- Review, screenshots, news, and links.
- http://psp.gamezone.com/gamesell/p25748.htm

GameFAQs
- FAQs, cheats, reviews, game saves, and a message board.
- http://www.gamefaqs.com/portable/psp/data/920827.html

Gaming Age
- Review, by Brian Peterson: "Game play, in a word, frustrating. I also have another word, boring!" [Grade: D-]
- http://www.gaming-age.com/cgi-bin/reviews/review.pl?sys=psp&game=rengoku

PSX Extreme
- Review, by Frank Provo: "The graphics are sharp and the animation is smooth, which is what you'd expect from a PSP game." [Score: 4.6 out of 10]
- http://www.psxextreme.com/scripts/reviews3/review.asp?RevID=23

GameSpot
- Reviews, news, previews, images, videos, cheats, links, and a forum.
- http://www.gamespot.com/psp/action/rengokuthetowerofpurgatory/

1UP
- Review, by Robert Ashley: "Rengoku is basically a series of inconveniences and bad design decisions." [Score: 2 out of 10]
- http://www.1up.com/do/reviewPage?cId=3140235&did=1

GameStats
- Videos, screenshots, average scores, and article links.
- http://www.gamestats.com/objects/683/683129/

CCG
- Provides hints and unlockables.
- http://www.cheatscodesguides.com/playstation-portable-cheats/the-tower-of-purgatory/

IGN
- Reviews, screenshots, videos, previews, news, and a message board.
- http://psp.ign.com/objects/683/683129.html

GameSpy
- Review, preview, news, screenshots, and cheats.
- http://psp.gamespy.com/playstation-portable/the-tower-of-purgatory/