How do you unlock extras in LEGO Batman 1?
Enter cheat codes at the Batcomputer in the Batcave (Enter Code menu). Extras include stud multipliers, the Minikit Detector, Invincibility and dozens of characters and vehicles.
In LEGO Batman: The Videogame (2008), the cheat-code menu lives in the Batcomputer in the Batcave. Codes unlock playable characters (e.g. ZAQ637 Alfred, MVY759 Nightwing), vehicles (e.g. KNTT4B Bat-Tank, HAHAHA Riddler's Jet) and extras / red-brick effects (e.g. WYD5CP Invincibility, ZXGH9J Minikit Detector, 18HW07 Studs x10). Once a code is entered, the extra needs to be toggled on in the Extras menu and many cost studs to activate.