This is also quite a tough one with a tight time limit. You need to finish the 3 mission objectives in under 2 minutes 50. When I did it, I did it with 3 seconds to spare. You really want to try and learn where the majority of the plants are and while going for them and the cloud rings, make sure you are taking down pterosaur's too as you don't want to be playing catch-up with those once everything else is done. If you can, pick up the homing missiles to save you a couple of seconds here and there.