The max amount of friends you can add in-game will increase with your level.
When your level is under 10, you can have 50 friends at most.
lv11-15, 60 friends in total ;
lv16-20, 70 friends;
lv21-25, 80 friends;
lv26-29, 90 friends;
lv30, 130 friends;
Starlight has 200 friends.
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Game Guide for Mobile Legends – moonton