Grey Matter Exercise

Now you can test your brain power with this game.
The grey matter exercise is based on a stroop effect with retro sound effect.
Improve concentration and relax your brain with this game.

Choose the color name text, e.g., the color name text shows "blue," then tab
on the blue button. It does not matter the background color of the text.
If you score above 25K, the surprise button is enabled.