Boardgamegeek https://boardgamegeek.com/boardgame/300329/harry-potter-strike-dice-game
English - In more detail, each player starts with the same number of six-sided dice, and one die starts in the arena. On a turn, the active player rolls a die into the arena. If no die faces in the arena match, the player can end their turn or roll again; if the player rolls an X (or hits any dice that then show an X face as a result), those dice are removed from play.