REGISTER TO REMOVE ADS
Chests, obviously. Sora can't open chests until Yuffie tells him he can. In Halloween Town, Sora unlocks the artificial heart. In KH2, he unlocks the Underdome and the gate to the land of the dead to escape Cerberus. In Atlantica he unlocks Ursula's prison around Ariel's voice. Roxas uses it to unlock the gate to the mansion in Twilight Town. Terra uses it to get out of his cell in Deep Space. Beyond that, I can't remember.How many times have keyblade users been able to use their keyblade to open locks that aren't the "official keyholes" in Disney Worlds? I'm sure they've been able to do it but for the life of me I can't remember most of them.