How to get more energy?

Whenever you tap an item to get something, you will consume one unit of energy. Despite starting out with 100 energy, it can go quite quickly. You get back 1 unit of energy every 30 seconds (until your energy reaches 100), you can also get more energy from the energy tiles that come out of the energy box. You should merge these energy blocks to their max level before double tapping them and getting the energy from them. This will get you the most energy from the energy box.

After you have run out of energy for the first time and second times, the game does give you 100 free energy too. After that you get get free energy by watching a video ad, if one is available, or you can purchase some energy with gems.

You can also get more energy when you go up a level.