At the main menu, hold L + R and press Up or Down.

After the game is completed, levels may be played again with added, moved, or missing objects. Each level will also have a time limit. Additionally, successfully complete the game. Then, go to the stage select screen, and scroll through all the levels until the word "Extra" appears. Restart the game to be able to jump five instead of three times in a row.

Successfully complete the game (not including extras) without using any continues to enter Super mode. In this mode, you can jump six instead of three times in a row. Press Triangle to fall faster and do more damage when landing on enemies. Press L to run faster and jump farther.

Successfully complete all missions.

In mission 29, kill a zombie near the Chimaira sign, then get the avatar that it drops. The sign is located in the long street section under the park at the top of the map.

Successfully complete all missions.

In mission 5, kill a zombie near the Slipknot sign, then get the avatar that it drops. The sign is located almost in the center of Time Square.

Win ten online fights in Infrastructure mode to unlock Boneshell.

Win ten online fights in Ad Hoc mode to unlock Moby.

Get all upgrades for Megaman, except for the arm upgrade. Keep playing until you fight Vile the second time in Sigma Palace 3. Defeat him but make sure you do not have the arm upgrade. After defeating him, you will automatically get Zero's Buster from him.

Successfully complete all levels on the Adventurer difficulty to unlock the Harem Time Trial level.

Successfully complete all levels on the Grad Student difficulty to unlock the Treasure Room Time Trial level.

Pause the game, then hold L + R and press Down(2), Right(2), Up(2), Left(2). If you entered the code correctly, you will hear a sound.

Pause the game, then hold L + R and press Right, Down, Right, Down. If you entered the code correctly, you will hear a sound.

Pause the game, then hold L + R and press Left, Right, Left, Right. If you entered the code correctly, you will hear a sound.

Pause the game, then hold L + R and press Up(2), Down(2). If you entered the code correctly, you will hear a sound.

Pause the game, then hold L + R and press Down, Left, Up, Right to unlock all costumes. If you entered the code correctly, you will hear a sound.

Successfully complete the game to unlock the "Continued Play" option, which allows a new game to be started with all previous stats and items, and an alternate main menu background (with characters from the game).

Successfully complete Hero 300 mode to unlock Hero 3 mode.

Successfully complete Hero 30, Demon King 30, and Princess 30 modes to unlock Knight 30 mode.

Successfully complete Hero 3 mode to unlock the music player. Press Select to access the music player.