Press A, A, C, A, B. This code must be executed in a two player game. When activated, the words "Blood Feud" appears on the screen, no additional drones are launched after the initial three for the preview, and the boss is never launched. The last player alive wins the match and gets the points for the "Boss Kill" for a normal level. Each round lasts forty-five seconds. If time runs out, both players lose a life. A new round begins each time a player is killed until one of the players has no lives left.
Press LS + C during the demo loop to access the game settings (difficulty and blood), as well as game credits and hardware tests for the joypads.
Press C, B, B, A, A, C. This code must be executed by a non-active player in a one player game on the second control pad. When activated, the words "Px BE THE BOSS" appear on the screen, where x is the non-active player. In a level with drones, the non-active player controls a single drone as if it were a player character. The controlled drone is very bright compared to the other drones. Control switches to a new drone if it dies or if the non-active player presses the C. When the boss is launched, the non-active player is in control of it. Note that turbo can be used but it slowly eats away at the boss' hit points.
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