Clash Royale is a tower rush video game which pits players in games featuring two or four players (1v1 or 2v2) in which the objective is to destroy the most opposing towers, with the destruction of the “King’s Tower” being an instantaneous win. After three minutes, if both of the players/teams have an equal number of crowns or none at all the match continues into a 2-minute overtime period and the player who destroys an opposing tower wins instantaneously. If no towers are destroyed during overtime, there is a tiebreaker, where all towers rapidly lose health, and the tower with the least health is destroyed. If two towers have the same health, there is a draw.
More details about the game here: https://clashroyale.com/
UEG game rules: Clash Royale rules