FilePlanet
- Provides introduction and gameplay movies.
- http://www.fileplanet.com/13912/0/section/Gradius-III-and-IV

Game Revolution
- Cheat codes.
- http://www.gamerevolution.com/oldsite/games/codes/ps2/gradius3_4.htm

Cheat Code Central
- Codes for Gradius 3 and 4.
- http://www.cheatcc.com/psx2/g3a4.html

All Game Guide
- Reviewed by Michael Kwiatkowski [2/5]. "Only enjoyable if you equate fun with frustration, but most gamers have long since outgrown that philosophy, as have most games. Yet Gradius III and IV clings to its roots like a long rotting tooth." Featu
- http://www.allgame.com/cg/agg.dll?p=agg&SQL=GRH||||25301

IGN
- Reviewed by David Smith. [6.5/10]"Certainly a purely retro affair, aimed only at a small enthusiast market, but it's retro gaming done properly, a package that's worth the money to its target audience." Includes screen shots, gameplay movies, an
- http://ps2.ign.com/articles/163/163590p1.html

PlanetPS2
- Reviewed by Ben Turner [67/100]. "Some people still enjoy the outdated and arguably unfair rules of Gradius, and if you're one of them, then you'll probably enjoy this package a great deal." Includes screen shots.
- http://www.planetps2.com/features/reviews/2001/gradius3and4/

GamePro
- Review [4/5]. "Hardly pushing the limits of the PS2, Gradius III and IV is a shooter combo package that will appeal to retro gaming fans." Includes screen shots.
- http://www.gamepro.com/sony/ps2/games/reviews/7053.shtml

GameSpot
- Ryan Davis review [6.3/10] includes screenshots. "Anyone looking for a solid side-scrolling shooter would do well to pick up this game."
- http://www.gamespot.com/ps2/action/gradius34/

Neoseeker
- Offers cheat codes, manual translation, discussion board, and links to reviews.
- http://www.neoseeker.com/Games/Products/PS2/gradius3_4/gradius3_4_cheats.html