Trading Card Game based on the LEGO Nexo Knights franchise. Two players build decks from a card pool of character, action and vehicle cards. Each deck must contain at least 20 cards in the base game or 30 cards in the advanced game. The same card must not be included more than once per deck.
During the game, players alternate placing one character on a playing field containing 3x3 spaces (base game) or 4x4 spaces (advanced game). Character cards feature numerical values on each of the four card edges. After a character is placed next to at least one opponent's character, one or more duels are fought by comparing adjacent numerical values. The character with the higher value wins the duel, and the losing character is turned by 180°, indicating a change of control. Action and vehicle cards provide boosts to character stats or have other effects. The game ends when all spaces of the playing field are filled with a character, and the player who controls the majority of characters wins.
Game is sold in booster packs containing 5 cards.