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The Patch is an item found in the game Donkey Kong Country 3: Dixie Kong's Double Trouble!. Funky Kong requires it in order to patch up the hole in his Hover Craft.
When Dixie and Kiddy Kong defeat Arich in Kremwood Forest, the giant spider drops a Patch. By returning to Funky's Rentals, Funky himself states that the patch is exactly what he needs to finish repairing his Hover Craft. To repay the Dixie and Kiddy, he allows them to use the craft at any time.