User summary: Characters utilize Ka, Chi, Sui, or Fu (Elements) and Kuji-in (Ninja Magic) to battle against each other and discover which are genuine Ninja and which are Gaijin masquerading as Ninja. The game is played in rounds with characters determining their actions by drawing and playing cards from a standard French deck. Play also involves the characters' consumption of poison to prove physical stamina and worth; this action must also be "live action role-played" by the players drinking something (the rules suggest alcohol be used).