RAT TRAP was going to be a full commercial release by Audiogenic, then Acclaim got the licence for KRUSTY'S SUPER FUN HOUSE and basically bought RAT TRAP from Audiogenic, changed the character and changed the name.
Manual (Only English and French included) [Source: Retro Commodore]
Enter “ZACHARY” for the password and you will be given infinite lives. You will also be able to go anywhere.
(LEVEL CODES)
Level 2-“NELSON” Level 3-“PATTIE” Level 4—“MRPLOW”
Level 5-“MAGGIE”