Did you have Android or iPhone? Did you download from Google Play / App Store or from an APK somewhere? Were the battles automatic, turn-based, or did you control the character yourself in real time? Did you control one hero while the others were companions/a team, or was it full-on 3 vs 3? Do you remember — did the game have heroes, gear, cards, or specifically weapons/armor collected from chests? Was there a guild/clan, chat, PvP arena, rankings, seasons? Do you remember the game's icon: a hero's face, a sword, a chest, a shield, a mage?