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 1990 for DOS-based PCs and was available as either a 5.25-inch or 3.5-inch floppy disk.
Adventures in Nimnul's Castle is an action game were players must guide the chipmunk characters Chip and Dale through nine levels while avoiding enemies and obstacles. Each level takes place in one of three locations: outside the castle, on the castle steps, and inside the castle proper, with the stage objectives varying between them, such as simply avoiding all enemies while moving across the screen or collecting items such as screws. Players are awarded points for each successful objective they complete, and have three attempts to make it through the game. Short cutscenes appear at the beginning and end of the game, as well as after certain levels.
Source: Wikipedia, "Chip 'N Dale Rescue Rangers: The Adventure in Nimnul's Castle", available under the CC-BY-SA License.