Battle mode
Successfully complete the game. The game will automatically save after the credits have completed. A battle mode option will be unlocked at the main menu.
Linear launcher
Get an A ranking with Steve Burnside, Chris and Albert Wesker and both versions of Claire in battle mode to unlock the linear launcher. It will appear in your inventory during the next battle mode game.
Steve Burnside cross-fire with sub machine guns
While playing in battle mode, kill all but one zombie in any room. While equipped with sub machine guns, walk up to the zombie and press [A], and Steve will cross his sub machine guns. For best results, play in third person so you can see the cross-fire. If there is more than one zombie, Steve might aim at two zombies rather than cross-firing at one.
Play as Albert Wesker in battle mode
Take Albert Wesker's sunglasses from the floor in the Incubation Lab after the intermission sequence when playing as Chris. Alternately, perform well in battle mode with Steve Burnside.
First unlock Steve Burnside. Then, play as Chris and finish with the best grade to unlock Albert Wesker. He is armed only with a knife and has two mixed herbs.