When your energy is too low to start another game you can refill your Energy Can immediately by using Tetris Cash.
When you see the window “Not Enough Energy”, click NO to skip using items in your Energy Bag. The next window will pop up and ask you if you want friends to help you, or use Tetris Cash to buy a refill. Click the “Buy Energy” button to instantly refill your Energy Can. If you have enough Tetris Cash, your Energy Can will immediately refill. If you don't have enough Tetris Cash, you will go to the “Get Tetris Cash” page to purchase more Tetris Cash.
You can purchase full Energy refills in the Shop. Every purchase of Energy refill will immediately fill up your Energy Can so you can get right back into Tetris action.