Igura is a vicious battle game that may result in the death or murder of participants. To participate, one must go to Toshima's palace, meet with a man named Arbitro, and tell him their reason for their decision to enter into Igura. Upon meeting with Arbitro, participants are given five dog tags, each engraved like a card in a standard deck of playing cards. One tag must hang from the participant's neck as proof of participation. Participants must then put their lives on the line to collect others' tags, with the goal being to collect a Straight or a Full House using cards 10 through Ace. (The game incorrectly refers to such a Straight as a Royal Flush, which is a poker hand that requires that all cards be of the same suit.) Tags representing cards less than 10 are referred to as "pig tags" and can be used in dedicated neutral zones to purchase sustenance, first aid supplies, and other essentials. If a participant collects a Straight or Full House consisting of the tags representing the cards 10 through Ace, they earn the right to challenge Il Re in battle.