Chip 'n Dale Rescue Rangers: The Adventures in Nimnul's Castle (also spelled without an "s" as "Adventure in Nimnul's Castle" on the title screen) is an action video game developed by Riedel Software Productions and co-published by Hi Tech Expressions and Walt Disney Computer Software based on the Disney animated series of the same name. The game was released in March 1990 for DOS-based PCs and was available as either a 5.25-inch or 3.5-inch floppy disk.