Good luck dear friend

The color is identified by the 'cone cell' in the human eye's retina.
There are three types of cone cells to distinguish colors. One is particularly sensitive to red light wavelengths, another to green light, and a third to blue light.
Cone cell distribution ratios for the 'red region', 'green and yellow region', and 'blue region' are generally composed of [40]: [20]: [1].
Due to the relatively small number of cells that detect blue, many users in this App review say blue identification is the hardest.

* Please take a break after the game for a certain amount of time to protect your eyesight.
* This game is free, and does not contain any stimulating content, so anyone can enjoy it.
* Comments on translations are always welcome.
* If you have any questions or bug reports, please e-mail us.
eye.gamesa@gmail.com

// Option A //

To download Color Smile mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download Color Smile mod APK.
2. Save the file in your device Downloads folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B //

To download Color Smile from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search Color Smile in HappyMod App.