Complete the "Breaking the Ice" level by defeating the final Boss. To reach the bonus level, Go to the main room in the Batcave and fly up to the Bat-logo elevator located to the left of the Batcomputer. Once you are in in the Trophy Room, fly all the way right to access a studio set that resembles to the Wayne Manor study featured in 1966 Batman television show. Swap to a character with a grapple gun. Pull the grapple point found to the left of the bookcase to reveal a secret passage. Jump on the poles and slide down to start the bonus level.
Adam West can be found in each level, and at least one more in every hub area. Find and rescue him as indicated.
Go to the character select screen and let the cursor sit over a character. (Don't select anyone, stay on the screen.) Waiting for a moment causes the selected character to sing the Batman Theme from the tv show.Note: Does not work with all characters.
Some characters are be unlocked naturally by progressing through the storyline while others require Character Tokens to unlock them for purchase at the store. Complete the indicated task to unlock the corresponding character.
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Pause game play, then enter one of the following codes to activate the corresponding cheat function.
Highlight a character at the selection screen and remain idle without selecting them. Certain characters will begin singing the theme from the classic Batman television show.
Select "The Lantern Menace" level in Free Play mode. Go to the first part. Progress from the start until you reach the point where you are facing a large Brainiac skull in a symmetrical room. On the right side should be an electric field, and on the left an electric port. Switch to any character that has an electricity suit (also, put on infinite electricity if desired) and fill the port on the left. This should get rid of the Brainiac tentacles on the top of the stairs, and fire should replace them. Switch to Superman and walk in the middle of the fires. Initiate his freeze-breath. The fire is extinguished, you get studs for it, but the fire will immediately return. Extinguish the fire repeatedly with Superman to get as many studs as desired. Using any stud multiplier will make this even more effective .
While the game is paused:
Pause the game and go to Extras menu. Then click the enter password menu.
Search the indicated location for the corresponding brick.