When the Sensei lesson is over, the ninja apprentices meet in the courtyard of the dojo to practice an explosive game. The players will divide into teams, and pass a bomb that must never touch the ground, otherwise it will explode. During the game, the players will play numbered cards of value 1 to 8, by forcing by an announcement another player to play a card whose value is "above" or "below" the one they have just played. . If the player cannot play a card corresponding to the announcement, the bomb explodes. When a player manages to play all the cards in his hand, he is safe and sound for the remainder of the round. The teams that manage to save their players as soon as possible will get the best trophies.