Card-Jitsu

Card-Jitsu is an ancient art of the Ninja involving multiple different types of cards, one to four opponents, and a lot of thinking. In order to win, one must play the right cards, three of different colors or three of the same element but different colors, to defeat his/her opponent in a battle. This is repeated until the penguin in question has earned their black belt and is ready to fight Sensei. Once Sensei is defeated, he/she becomes a ninja.

To get there, players need to go to the Dojo Courtyard, which is accessible via the map, or the spy phones. and enter through doors. You can earn your belts by winning matches.

Remember that:
 * Fire beats Snow.
 * Snow beats Water.
 * Water beats Fire.
 * If same element, highest number wins.
 * If same element and same number, it is a tie.
 * You have to get different color of each element or three different colors of the same element to win the game.
 * Power Cards have special effects.

Rewards
You cannot earn coins while playing this game, but after playing a certain number of games, players are rewarded with a belt. When they reach the Black Belt, they must challenge Sensei and earn the Ninja Mask, which grants players access to the Ninja Hideout.

Trivia

 * There is a teaser that says "Stay ready. Look to the mountains, the elements are coming."
 * The player will always lose against Sensei until they get their black belt.