A popular way I've seen in many quests is to do this:
Task#17 (just picking a random number here lol):
Put a trail of gems, horseshoes, clovers, skulls, or golden mickeys that lead to a
teleporter for the other person's room. Select this option by clicking "Have the
players find multiple items" or something like that. Make the player have to
find all of the items.
Task#18
Tell the player to go through the teleporter and have them find more gems,
skulls, horseshoes, golden mickeys, or clovers in that room.
Then you would have taken your quest to a different room!
If you don't understand I could possibly make a video of it.