While exploring the various storylines, special events, and timed islands you might come across different obstacles. There are different ways to get past each obstacle, listed here.

Gates/Doors:
Gates are removed/cleared either by using Energy to clear them, or by fulfilling the removal quest.

Bridges:
Bridges are fixed by fulfilling the building request.

Energy Animals:
Sometimes there will be an injured animal that you need to expend Energy to help. This will be in the form of a wheel that you spin with Energy to meet the number required. Each animal helped will leave behind a unique reward as well as a large number of items!

Request animals:
Sometimes there will be an animal that requires certain items. You will need to produce/harvest/gather the items requested for the animal to move away. Each animal helped will leave behind a unique reward as well as a large number of items!

Enemies:
Sometimes you will see something that has a number above its head. The Dragons will automatically fight it. There are also enemies that you need to tap on, then tap the yellow lightning to fight it. This will usually give a unique reward. Both of these actions use up Dragon's stamina, so if your Dragons are tired and resting you will need to wait for them to recover.