Die Spielanleitung könnt ihr hier herunterladen.

Lost Legacy: Binbo Tantei to Inbo no Shiro contains both the Basic Set: "Orb of Seduction" and the Expansion Set: "Eternal Grail." (Note: You are not supposed to use all cards at the same time. Instead, each set is a slightly different game following the same rules. To play, use either the base set, the expansion set, or a custom mix of 16 cards from both sets.)

Lost Legacy: Binbo Tantei to Inbo no Shiro is a game of risk, deduction, and luck for 2–4 players. You start the game with one card in hand from a deck of sixteen cards. On a turn, you do the following:

Draw: Draw the top card from the deck and add it to your hand.
Play: Choose one of the two cards in hand to play and place it face up in front of you.
Effect: Carry out the played card's effect, after which the card is considered as discarded.
End: If there is at least one card left in the deck, the turn goes to the next player; if not, the investigation phase starts.

Using the investigation speed indicated on the card each player has in hand, players take turns guessing which player (whether yourself or someone else) holds the "Lost Legacy" card; this card might also be in the "Ruins", a location that holds one card at the start of the game and possibly acquires more cards during play. The player who guesses correctly wins; if no one finds the Lost Legacy, then everybody loses