Card-Jitsu is a card game which is located in the Dojo. It was released on August 14, 2017. It was removed on September 25, 2017 for bug fixing, but it later returned on December 27, 2017.
To get there, players need to go to the Dojo Courtyard and enter through doors. You can earn your belts by winning matches.
It is essentially a more advanced version of "Rock Paper Scissors", in which:
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.
You can not earn coins while playing this game, but after playing a certain number of games, players are rewarded with a belt. When they reach black, they must fight Sensei and earn their mask which grants players access to the Ninja Hideout.
There is a teaser that says "Stay ready. Look to the mountains, the elements are coming."
It could be played for around an hour during the Open Beta Party, but it was heavily glitched and things would freeze. The game was then shut down temporarily as things could be ironed out.
From July 26, 2017 until August 2, 2017, you could spot some penguins coming from behind the Pizza Parlor in the Plaza. You could also see one coming from behind the Gift Shop in the Town. These are predicted to be ninjas, meaning this was done to tease Card-Jitsu. From August 2, 2017, you can see ninjas through the windows of the Dojo.
Card-Jitsu was originally meant to be released on August 11, 2017. But was delayed due to server fixes. It was delayed even further on August 12, 2017, as more bugs were found that prevented the team from releasing the minigame.
The player will always lose against Sensei until they get their black belt.
There was going to be an update for the game which included a leaderboard, but it was cancelled. It is unknown if it will ever come.
Some time around April 2019, so many people showed up at the Dojo that starting a match would usually show the screen saying "Lost connection."