There are several boosters in the game:  bomb, paint bucket, rainbow, magnifier, and a God Mode.

The bomb colors the area of five pixels away from the spot you choose.
The paint bucket colors all the pixels of the color you choose in the area limited by other colors.
The rainbow colors all the pixels of the color you choose.
You can find these three boosters at the top of the screen. The numbers on their icons show the amount of boosters you have.

There are 4 ways to get boosters in the game:
1. Get a daily bonus
2. Complete a marathon
3. Watch an ad: when you are running out of a booster tap its icon and watch an ad to get a booster
4. Purchase boosters in our game store: to access the store tap the coin icon at the right top corner 

Also there is a magnifier at the left bottom corner which can help you to find missing pixels you need to color. When you start coloring you get 3 minutes of free use. To get extra time tap the magnifier icon and watch an ad.

Plus there is a pop-up periodically appears on the game field. It offers to use a special booster (God Mode) which can help to speed up the coloring. Here's how it works: tap the pop-up, watch an ad, and then color as much as you can in 12 seconds by swiping the screen without paying attention to colors.