Find... Twilight crystal
Find it Another crystal you can only find towards the end of the game in The World That Never Was. Assassin Nobodies drop them and they're used to make the powerful Ultima Weapon.
Find... Blazing gem
Find it Fat Bandit and Fiery Globe Heartless drop these in Aladdin's Agrabah level. They're not particularly strong, but can be used to synthesize a helpful Slayer Earring accessory.
Find... Bright gem
Find it There are loads of places to find these including Space Paranoids and Pride Lands. Aerial Knockers, Magnum Loaders, Surveillance Robots and the Bulky Vendor all drop them.
Find... Dark gem
Find it To find these, visit the Beast's Castle and defeat either a Gargoyle Knight or a Gargoyle Warrior. You can use it with free development to create a really rather useful Expert's Ring
Kingdom Hearts 2 streamer spends 2 hours grinding a 9999-hit combo, gets enough cash for 1.2 healing potions: "This is possibly the most stressful thing I've ever done"
Kingdom Hearts forced Naughty Dog to go "oh sh*t" while making Jak 2, because Square Enix's character models were so much more detailed that the platformer devs had to change course
