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One version is common, at least one other version is rare
 Game design by John Dale and Martin Day; level design by John Dale. Coding by John Dale and Adrian Stephens. Graphics by Adrian Stephens; graphic design of monsters by Herman Serrano. Sound by John Dale and Martin Day (Spiny Norman).
 Levels 61-70 are skipped in one-player mode as they are designed for two-player mode by default, given the screen is newly-split into two halves.