OpeningEvent Slots will allow you to choose between different Game Modes to play. Eachslot also gives you a different coin reward and is unlocked after you have 3, 5and 8 heroes. The first slot will allow you to collect a maximum of 80 coins, secondslot 40 coins, third slot 12 coins, and last slot will give a max of 20 coins.Unlocking the last Event Slot also gives double XP.