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CONTAINS SPOILERS
Slipskate Slope: Key Location
The key to the Cat Shine locked in the bird cage can be found by working your way to the lighthouse on Slipskate Slope, near the end of the area. The key is only revealed once the objective "Key to the Cat Shine" appears. Once you grab the key, backtrack to the beginning by walking on the right ledge of the area. You'll be able to jump on platforms that stick out of the wall.