Roy's Matrix

A simple-to-learn, hard-to-master puzzle game. There's no timer, no scores, no leader boards, and no purchases. Just one screen with nine tokens placed. Click on one token and it, along with all the other tokens in the row and column, change colour.

The order goes this way - Red > Green > Blue

Since no rules are mentioned, you can jumble it and give it to your friends to solve it.