Here is the idea, there are going to be anvils hidden around the hide&seek map, you will get an upgrade for the every player you kill. For example, a diamond sword will fall for the 3rd player you kill, exp bottles and sharpness 1 for the fourth player, exp bottles and fire aspect 1 for the fith player, etc. (Rewards: Enchanting bottles&books, diamond sword, ender pearls, speed potions.)