Key

Used to open safes for items and helpful information.

Hammer

Once equipped, hitting walls in the adventure mode of the game will cause hidden doors and items to appear.

Candle

Useful to see rooms that have no light.

Glasses

Equipping these can reveal hidden doors.

Transceiver

Functions as a radio to talk to trapped goonies and even Konami.

Diving Suit

Needed to access the underwater levels.

Ladder

Gives access to hidden entryways in the ceiling and in the floor.

Helmet

Given by the woman without glasses, it will prevent icicles from causing damage to Mikey.

Waterproof Coat

Prevents damage from geysers and waterfalls.

Bulletproof Vest

Doubles Mikey's defense.