The Guardian Legend/Items

Item tiles
Throughout the game, you must collect various Items to improve the firepower and health of the Guardian. Items may be found inside capsules like the one shown to the right, some may drop from enemies, and some may be granted after completing a Corridor. You must shoot the capsule to obtain whatever item it contains.

Keys
Doorways that have symbols on them require the key with the same symbol in order to access what's found on the other side. Keys are obtained by defeating bosses found at the end of particular corridors. Finding these keys will expand the amount of labyrinth that the Guardian can explore.