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A comprehensive list of all inventory items in Cave Story, including their descriptions, locations, and any special notes for obtaining them.

This is a comprehensive list of all the inventory items available in the game. They are listed in alphabetical order.

• Alien Medal — Description: Engraved with the silhouette of an alien. It has no use. Location: Waterway (Ironhead boss fight). Notes: This item will automatically appear in your inventory if you defeat Ironhead without taking any damage in the process.
• Arms Barrier — Description: When you take damage, the amount of weapon energy lost will be halved. Location: Camp, Labyrinth W. Notes: This can be acquired before you get the Booster. Jump into the nearby purple Critter while it is hovering. The knockback will propel you into the tunnel.
• Arthur's Key — Description: The key to Arthur's house. It was hidden near Arthur's gravestone. Location: Graveyard. Notes: Arthur's House is in the lower left corner of Mimiga Village. Use this key to unlock the door.
• Beast Fang — Description: none. Location: Yamashita Farm. Notes: This item is hidden in the block underneath the Life Capsule. You need to use the level editor in order to obtain this item. It doesn't seem to do anything.
• Booster v0.8 — Description: Push the jump button again in midair to fly even higher. Location: Labyrinth B. Notes: This version of the Booster only allows for limited upward propulsion. You can skip the getting the Booster v0.8 by jumping over the gap where Professor Booster fell.
• Booster v2.0 — Description: Push the jump button in midair and you can move in any direction. Location: Arthur's House, Mimiga Village. Notes: Professor Booster gives this to you if you skipped getting the Booster v0.8. This version of the Booster is capable of long, sustained mid-air propulsion in any direction. This item is necessary to unlock the secret stage Sacred Ground.
• Broken Sprinkler — Description: A busted water sprinkler. Location: Plantation. Notes: Trade this in for a (working) Sprinkler in the Rest Area.
• Chaco's Lipstick — Description: Red lipstick. It has no use. Location: Chaco's House, Grasstown. Notes: Get Chaco to explain to you about Jellyfish Juice, then rest on the bed. When you wake up, this item will automatically appear in your inventory.
• Charcoal — Description: Taken from a fireplace. Location: Santa's House, Grasstown. Notes: One of the three ingredients necessary to make an Explosive.
• Clay Figure Medal — Description: Small and profoundly heavy. It has no use. Location: Last Cave (Red Demon boss fight). Notes: This item will appear inside a chest after you defeat Red Demon.
• Clinic Key — Description: It says "Labyrinth Clinic". Location: Camp, Labyrinth W. Notes: The physician gives this to you.
• Controller — Description: Necessary to make a rocket. Pride of Itoh, the cowardly man. Location: Storehouse, Outer Wall. Notes: You must get this from Itoh and bring it to Mrs. Sakamoto.
• Cure-All — Description: Apparently this cures anything and everything... Location: Clinic Ruins, Labyrinth W. Notes: This is needed to heal Curly in Camp.
• Curly's Air Tank — Description: You can breathe underwater with this. Curly used to use it. Location: Core. Notes: This item enables you to travel underwater indefinitely. Curly gives this to you after you beat the Core.
• Curly's Underwear — Description: Retrieved from behind the wall. Yellow-green panties with a cute little insignia. They have no use. Location: Small Room, Sand Zone Residence, Sand Zone. Notes: If you use the map system, you can see a hidden path. Follow it to the end and press Down to obtain Curly's Underwear. Curly doesn't seem to react to it.
• Explosive — Description: An explosive for blowing up doors and such. Location: Power Room, Grasstown. Notes: Obtaining this item requires Jellyfish Juice, Charcoal, and Gum Base. It is needed to free Kazuma.
• Gum Base — Description: A clump of gum. Location: Gum, Grasstown. Notes: One of the three ingredients necessary to make an Explosive.
• Gum Key — Description: A tag says "Gum". Location: Grasstown. Notes: Kazuma gives this to you after