 "The World Ends with You" features "psych pins", decorative pins which possess powers that only Neku can activate while wearing them.Psych pins are used for combat, for "Tin Pin Slammer/Marble Slash", or as trade value for money or equipment.Most pins, particularly those used in combat, can become more powerful as the player accumulates "Pin Points" (PP) which can also lead to evolution of the pins into more potent versions.