This is a brain training game that you have to choose the color of the randomly displayed texts from red, blue, yellow, and green. It doesn't matter what the text means. The score is determined by how many correct answers you get in 30 seconds. If the answer is incorrect, the score will decrease. You can turn off the sound by unchecking "Sound" in the menu item. You can turn off vibration by unchecking "Vibration" in the menu item. If you uncheck "Dark Mode" in the menu items, the background will be bright.