Resident Evil 2: DualShock Ver., known as Biohazard 2 DualShock Ver. (バイオハザード2：デュアルショックバージョン Baiohazādo Tsū: De~yuarushokkubājon ) in Japan, As the title suggests, is a second expanded version of Resident Evil 2 that became the base of other subsequent versions/ports of the game. The game was modified to incorporate support for the vibration function and analog control of the PlayStation DualShock controller.
The main addition is a new unlockable mini-game, "Extreme Battle". The objective is to reach the police station from the underground laboratory and retrieve four anti-biohazard bombs located throughout the station. There are four playable characters and three difficulty settings.
There are also some minor additions, such as ranking screens for the Hunk and Tofu mini-games, a Rookie difficulty setting for the main game, as well as a "USA version" mode in the Japanese version, based on the North American version's default setting and a new cheat code that grants the player unlimited ammo for all weapons.
The Dual Shock Ver. served as the basis for the majority of ports, such as the Windows 9x-based PC-CD release, which was titled Resident Evil 2 Platinum in North America. Aside from retaining all previously added features, the PC version can be run in higher Display resolution. A "Data Gallery" was also added to the main menu, allowing the player to view movies, rough sketches, illustrations and 3D models.