A deadly enclosed obstacle course with lots of treasure and dangers along the way.
The use of Border, Allow & Deny Blocks to keep your player from gaming the system.
A goal so your player knows when he / she has won.
Bonus Items
A prodding mechanic to keep the player moving ever forward for a simple in-line runner (such as a chain reaction TnT explosion that starts behind the player shortly after starting).
Deadly enemies of increasing difficulty for a maze (treasure should help player overcome more difficult enemies)