so what you would have to do is something like and a variable called levels or whatever you want and just add it to the event example I have. First group all the events and call it like Level 1 spawns and add the condition if level is = to 1... spawn these. copy the group and just change it up. if level is = to 3 spawn these. You'll have to make it so when player is on like level 1 set levels to 1, when player is on level 2 set levels to 2 and so on. That way whenever a player is on a certain level you spawn items, enemies or whatever from those groups