Sunset Riders (4 Players ver. ADD) is a four-player cooperative version of the game. The '4 Players ver.' signifies that it supports four simultaneous players, unlike the two-player versions. The 'ADD' code suggests a regional designation. This version likely offers the same core run-and-gun gameplay with the addition of simultaneous multiplayer action, enabling players to cooperate and progress through the game together.  Konami is the developer.

Sunset Riders (4 Players ver. ADD)

Sunset Riders (2 Players ver. EBD)