League System is a system similar to the Medal System which rewards players with medals that can be exchanged for various items at the Medal Exchange Center. The system has started since 28 June, 2016 along with the Wrath of the Dragon update.
For the first time a player plays, they will be given a rank most likely according to their previous scores in Season 6. They will then be distributed to a league according to the rank. In the league, the player must compete with 14 other people.
If the player is at the lowest place or places at the end of the league, they will go down one rank in the next league. If the player is at the top few places, they may go up one rank (or two ranks if having ranked up two times prior to the third advance in the ranks below King) in the next league. The places that let players rank up decreases upon every league, with the lowest places being three by the time you reach Legend V. The only exception is God rank, in which only the first four places stay in that rank, while the rest rank down.
At the end of the league, the number of medals rewarded will be the sum of your league rank and rank in your league.
League starts on Thursdays and Sundays at 9 p.m. (GMT+9) and ends on Sundays and Wednesdays at 9 p.m. (GMT+9). Any score achieved during Wednesday 9 p.m. and Thursday 9 p.m. will not account toward the next league. If it is a new high score, it'll still be counted as a personal high score. Once player plays a game after league starts, they will automatically be distributed into a league that was predicted at the end of the last league.
Note: Only Episode 1 has Rookie and Newbie Leagues. All other episodes start from Master Leagues.