Energy

Use
Energy is spent whenever you do the following:


 * Remove old farms
 * Collect castle rewards
 * Remove obstacles

How to obtain
You can obtain energy by doing the following:


 * Purchasing with coins
 * Collecting your daily scratch ticket
 * Watching an ad
 * (During some events) Advancing to the next stage
 * (During some events) Collecting "pixie storm" energy that float by on occasion [along with Level 0 units and ad viewing opportunities]