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Master code:
Press L, R, L, R, X(2), Y(2) at the main menu. A sound will confirm correct code entry.

Unlimited electric Batarangs:
Press L, R, B, White, L at the main menu. A sound will confirm correct code entry.

Unlimited Batarangs
Press L, R, White, Y at the main menu. A sound will confirm correct code entry.

Bonus characters
Press Left, Right, Down, White, L + R, then press Start at the main menu.

Bridge: Envelope B:
Knock out the thug at the start of the level. You should see the glowing item on the left when you start. Climb the ladder and jump/glide around the crate onto the other crate. Then, glide onto the platform with the letter.

Gasworks: Envelope E:
You will reach a room with two levels, each floor with two goons on them. First, take out the goons. Then, look around on the lower floor until you see a sewer pipe with boxes in the sewage. Carefully glide down and land on the first box. Jump over the next few boxes and pick up the envelope with an "E" on it. Finish the game and the "Infinite Health" cheat will be unlocked.

Plant Electrocution 2: Envelope C:
You will start the Plant Electrocution 2 level by sliding down towards some holes in the ground. The second hole is not fatal. Fall into it and glide (to avoid minor damage). You will see a lit area. Glide down there and pick up the item you find inside. Use the grapnel to exit, jump out of the hole, and finish the slide. The item you picked up should be the key do the door right beside the vines behind the glass. Go inside and fight one of the "Plant Men". You will find an envelope that has a "C" on it in the room. When you finish the game, you can activate this cheat for all weapons and unlimited ammunition.

Rooftop Battle: Envelope A:
When the clowns chase Mary, you will go up to the rooftops. Grapple hook up to her roof and beat up the white clown. Go up to the next roof, where you are on a little balcony. Jump across, then go in to see a thug run across a hall with the girl. Follow and he will jump off the roof. Follow, look down, and drop to lowest edge. Walk along to left until at the corner the grapple icon appears Grapple over, go in the door and pick up Envelope A.

SWAT Chase: Envelope D:
You will enter the elevator shaft. Ride the elevator all the way down until it stops. Get off the elevator and wait for it to rise again. After it rises, jump down to the bottom and use first person mode to find the control box. Use a Batarang to disable it and the door behind it will open. Stay clear of the elevator and wait for the correct time to get in the open room. Inside the room is "Secret Key 2." Get out of the room and ride the elevator up to the top. At the top there is a door that is supposed to be locked. The key opens the door, and inside is an envelope with the letter "D" on it. Finish the game and the "Infinite Special Move Bar" cheat will be unlocked.