Starting from version 4.0.0 we have introduced a new section of the game - Jigsaw Puzze Feed which allows you to share your images with friends and complete the ones shared by them.
Solving one of your friends' puzzles requires 1 point of Energy. You can see the total you have in the right upper corner next to your level and coins in the game.
1 Energy point is restored within 3 hours. Note: energy is restored from 0 to 1 only. If you have more than 1 point it will stay the same.
You may purchase Energy points using coins or money.
Sometimes the app offers you free Energy for watching short videos. If you can't get free energy, it probably means that there are no available videos and they will appear later.