Enter the following terms for extremely useful things:

INVINCIBILITY CLOAK - Put this on and you'll take no damage
INVISIBILITY CLOAK - Harmful creatures won't be able to see you with this item equipped
POCKET KNIFE - (Weapon) Infinitely useful!
LUNAR LANDER / LUNAR ROVER - Cancel out gravity in style -- the Lander is more compact
BLACK HOLE - A mini Black Hole forms to suck in ANY enemy or offending object (boulders, spiked steel balls) before dissipating a few seconds later into the ether...
SHRINK RAY - Shrink any enemy creature to a more manageable size
FREEZE RAY - Freeze enemies in a cube of ice (temporarily)
CHI - A friendly, floating Chinese dragon you can ride
REINDEER - It can fly!