At the main menu, press Up, Down, L, R, L, R, L, Left, Right, X(2), Y(2), B(2), L, Up, Down, L, R, L, R, Up(2), Down, Start, Select to unlock all extras. If you entered the code correctly, you will hear a sound.

At the main menu, press Right, Up, R, L, X, Y, Right, Left, B, L, R, L, Down(2), Up, Y(2), X(2), B(2), Up(2), L, R, Start, Select to unlock all episodes and Free Play mode. If you entered the code correctly, you will hear a sound.

At the main menu, press X, Up, B, Down, Y, Left, Start, Right, R(2), L, R(2), Down(2), Up, Y(3), Start, Select to unlock all characters. If you entered the code correctly, you will hear a sound.

At the main menu, press X, Y, B(2), Y, X, L(2), R(2), Up, Down, Left, Right, Start, Select. If you entered the code correctly, you will hear a sound.

At the main menu, press Up(2), B, Down(2), X, Left(2), Y, L, R, L, R, B, Y, X, Start, Select. If you entered the code correctly, you will hear a sound.

Successfully complete the game (all three chapters) to unlock Azrael for purchase for 1.5 million Studs at the Batcave.

Successfully complete the game (all three chapters) to unlock Huntress for purchase for 200,000 Studs at the Batcave.

Successfully complete all three Villain chapters at Arkham Asylum to unlock the Villain Hunt mini-game.

While the Studs are being totaled during the ending sequence, press A to skip the animation. You will still get credited for the Studs you earned and will get through the process faster.