TIPS AND TRICKS

Incomplete level hidden: In the Test Menu, you can select what level (or WAV as the game refers to them) you want to start from in the Game Adjustments menu. 
Selecting Wave 27 takes you to an unfinished level that serves as a Boss Rush where you fight the three boss characters (Fink Angel, Mean Machine, Precious Leglock) 
one after another. However, since the stage isn’t finished, completing it leaves Dredd stuck, unable to continue.