Booster Decks were packs of Card-Jitsu cards, available to players in order to play the different types of Card-Jitsu games. Each deck contained 9 regular cards and 1 card, for a total of 27 regular cards and 3 power cards. In addition, each one of them included an icon in the Inventory that opened the Ninja Progress once clicked.
- Originally, the Starter Deck and the Fire and Water booster decks were given by first talking to Sensei in Card-Jitsu or its elemental counterparts. Since Card-Jitsu Snow was introduced, they have been given automatically by first going to the Dojo or to the Dojo Courtyard.
- The decks' inventory icon formerly showed a certification rather than opening the ninja progress.
- There were 6 possible power cards you could get from the starter decks, however, you could only have 3.