Mystery Tunnel

The Mystery Tunnel is a tunnel located in Chip 'n Dale's Acorn Acres that temporarily replaces the tunnel leading to the Cartoonival Grounds during April Toons Week. Upon entering, Toons are teleported to the interior of a randomized Toon Building.

Before the new Mystery Tunnel was introduced for April Toons Week as of 2023, the original version was located in Chip 'n Dale's MiniGolf that caused Toons to simply revisit the area upon entering. During April Toons Week in 2015, it was temporarily replaced by the dark ominous tunnel of Bossbot Headquarters that led to "Barbecue Headquarters". Shortly after Bossbot Headquarters was discovered, the dark ominous tunnel became permanent.