Levels were designed based on a Deluxe Paint interface, which allowed several of the members to design levels, resulting in "hundreds of levels". There were several internal iterations of the levels, each designer challenging the others. Dailly pointed out that David Jones "used to try and beat us, and after proudly stabbing a finger at the screen and saying 'There! Beat that!', we'd calmly point out a totally new way of getting around all his traps, and doing it in a much simpler method. 'Oh...', he'd mutter, and scramble off to try and fix it." They also sent internally tested levels to Psygnosis, getting back the results of their testing via fax. While most were solved quickly, Dailly commented that "Every now and again though, the fax would be covered in scribbles with the time and comments crossed out again and again; this is what we were striving for while we were designing the levels, and it gave us all a warm fuzzy feeling inside."