Double Dragon IV

					
Unlocking Tower Mode:

The survival mode called ‘Tower’ will become unlocked when you complete the game by defeating the boss in Mission 12.
Unlock More Characters for 2-Player Duel Mode:

When you complete the following tasks you will 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.
Chin Taimei:

Complete Mission 7 of Story mode.
Cody:

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.
Mason:

Complete Mission 4 of Story mode.
Mysterious Warrior:

Beat Floor 40 in Tower mode.
Right Arm:

Complete Mission 8 of Story mode.
Rowper:

Complete Mission 2 of Story mode.
Sonny, Chin Seimei, and Yagyu Ranzou:

Beat Floor 30 in Tower mode.
Williams:

Complete Mission 1 of Story mode.
Yamazaki and Soeno:

Complete Mission 9 of Story mode.