One of the things that I always had in mind for the game was to create a process of mini-missions, where you must collect items at a particular time, or reach a certain point, trigger a trigger or other suchthings that were fun and break a little the way the game straight.
I developed a small case (still in testing phase) that generatesmissions based on two factors: x time to collect objects to accomplish the mission.
The initial trigger was already built and I'm working on refining(including audio and other important details), the task of testing I've done is working fine (collect 6 coins in 10 seconds).