Energy

Energy is a resource which is used in battles (1 each battle) to get resources, which in turn allow you to buy several ingame upgrades.

Importance of energy
Energy allows you to get resources at a battle (Bricks and Magnets if you win, otherwise only Bricks are given). Without it, you wouldn't be able to upgrade anything. NOTE: You still get (or lose) Trophies without Energy, as well as with Energy.

How much does it take to recover?
To get 1 Energy, you need to wait 3 hours and 3 minutes (no, the 3 minutes aren't a joke).

And... how many resources do I exactly get?
Bricks are calculated with this formula:

$$log1.5(totalscrap)*3*1.1^(arena)$$

Magnets depend in the arena you are, and only if you win.
 * Arena 1: 10 Magnets
 * Arena 2: 11 Magnets
 * Arena 3: 12 Magnets
 * Arena 4: 13 Magnets
 * Arena 5: 14 Magnets
 * Arena 6: 16 Magnets
 * Arena 7: 17 Magnets

Maximum Brick Gain
After all, you'll figure out the longer the match (aka more Scrap) the bigger the amount of bricks gained.

That's why some teams have decided to invent a farming method to get the most bricks possible, and without the risk of losing trophies.

Brick Farming Method
First note that you'll need 20 Minutes for this, as it is the time a match can take at most.
 * At first, you put two Square Blues and then spam Circle Blue until you can afford Gatling Gun.

WARNING: This is almost always an agreement between teammates, don't expect a foreigner to do this.
 * Then, put 1-2 Gatling Guns and spam Square Pink until you can afford Defense 3.
 * Put 2 Defense 3 towers and spam Banana Hole, one every 2 seconds, until you can afford Double Pain.
 * Fill the rest of the spaces with Double Pain and get to Not Too Fresh being careful not to kill your teammate.
 * in the end, you only have to put a Not Too Fresh every 6-8 seconds (here depends in the level of your Not Too Fresh and the teammate's Double Pain level) until you get the Tie! window. As usual, double your bricks and you will see a huge amount of bricks to your eyes.