Crumble Cavern is the first secret level of Autumn Heights in Donkey Kong Country: Tropical Freeze and its Nintendo Switch port of the same name. It is unlocked after finding the secret exit in Sawmill Thrill.
At the start of the stage, just past two Tucks and a Cheesy Chester, there is a vine leading down. As the Kongs proceed further into the level, they will encounter teetering platforms, controlled by two waterfalls that alternate on both sides, and more vines. After encountering more Cheesy Chesters near the giant cheese wedges in the background, the Kongs will enter a series of Barrel Cannons, some of which require the player to manually launch to the next one with timing.
Past the first checkpoint after the Barrel Cannons, there is a DK Barrel on a ledge reachable using a vine, which snaps and falls once Donkey Kong makes contact with it. More weak vines are found later on, which the Kongs must use to traverse the bottomless pit. After that, the Kongs will enter another sequence of Barrel Cannon blasts, except this time, at certain points, they can choose which Barrel Cannon at which to launch. Regardless of which paths they take, the Barrel Cannons lead to the next checkpoint.
After jumping across more teetering platforms and vines and launching from two more Barrel Cannons, giant stalactites will start to fall from above and break the platforms. While outrunning the stalactites, the Kongs will climb several more weak vines and find Barrel Cannons attached to idle stalactites. Upon entering one of these, the stalactite will start to collapse and drop, meaning the Kongs must time their launch to the next Barrel Cannon before it falls into the pit. The Kongs will eventually enter a Barrel Cannon that spirals up and around a large spire. The Slot Machine Barrel is at the top, and completing the level will unlock the second secret level, Rodent Ruckus.
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