Digimon World 4

The game is loosely based on the 2005 Digital Monster X-Evolution film, even using footage from the movie itself. Only the PlayStation 2 version was released in the PAL region.

The game's protagonists are members of the "D.S.G. (Digital Security Guard)". Based on Digital Monster X-Evolution, it is immediately revealed that a computer virus known as the "X-virus" is spreading quickly and is infecting many Digimon. "The Yamato Server" has disappeared, and a new server known as "The Doom Server" has taken its place. They are sent to the first area of the game named Death Valley to search for Chief Leomon. When it is completed the player finds out that The Doom Server may in fact be The Yamato Server. The player is then sent to destroy the "Doom Dome". This is where the first real boss appears, Apocalymon. The player is then sent to Dry Land to stop the X-Virus spreading and must defeat MaloMyotismon. They are then sent to the Venom Jungle to stop the Dread Note from launching and must then defeat Lucemon. They are then sent to the final area of the game Machine Pit to destroy the final boss Mecha Rogue X.

Digimon World 4 is an action role-playing game with elements of digital pet games. The game offers a choice of one of four starter Digimon: Dorumon, Veemon, Guilmon, or Agumon. Depending on what the player does in the game, the Digimon they select, and its level, it may gain a Digivolution. In this game the player does not use the Digimon powers but instead attacks the enemy by using weapons like swords, guns and axes.

Digimon World 4 was developed and published by Digimon series veteran Bandai. The game was first showcased at Electronic Entertainment Expo (E3) 2004 with release planned for that summer. It later enjoyed exhibition at E3 2005, and had gone gold by June 2. Specially marked copies of the game were packaged with a limited-edition Digimon trading card depicting a new Digimon called Dorumon.