How do I create a task where the map changes every 15 minutes? As with KnockIT / KnockOut / KnockFFA.
Be more clear what do you need exactly? Like a picture in the map that have number on it and changes every 15 minute?
Ok. You could make a task which sends all Players to a new world and afterwards unloads the original world they were in before. You could make a repeating task which is automatically executed every specific amounts of ticks. (1 second = 20 ticks, 1 minute = 60 seconds = 1200 ticks and so on...)