Unlocking Tower Mode:
When you complete the game by defeating the boss in Mission 12 you will unlock the survival mode called 'Tower'.
Unlock More Characters for 2-Player Duel Mode:
Complete the following tasks to unlock the corresponding character for 2-Player Duel mode.
Abobo and Burnov:
Complete Mission 6 of Story mode.
Casey and Shannon:
Beat Floor 25 in Tower mode.
Complete Mission 7 of Story mode.
Complete Mission 5 of Story Mode
Double Dragon 1 Jimmy Lee:
Beat Floor 35 in Tower mode.
Jake and Ashida:
Complete Mission 12 of Story mode.
Kodani and Jake:
Complete Mission 10 of Story mode.
Linda and Linda M.:
Complete Mission 3 of Story mode.
Complete Mission 4 of Story mode.
Beat Floor 40 in Tower mode.
Complete Mission 8 of Story mode.
Complete Mission 2 of Story mode.
Sonny, Chin Seimei, and Yagyu Ranzou:
Beat Floor 30 in Tower mode.
Complete Mission 1 of Story mode.
Yamazaki and Soeno:
Complete Mission 9 of Story mode.
At the 'Title' screen press Up(2), Down(2), Left, Right, Left, Right, X, Circle(2), X, Start to unlock stage selection. Note: You will only be able to select the stages you have already completed.
7 continues 1 player:
Choose 2 player b mode and defeat player 2. You can now play 1 player mode with 7 continues instead of 5.