Colour the blocks

Sharpen your mind with a connect-the-block-style one-line brain training puzzle game. A simple but addictive one-line puzzle game thatâ€™s completely free to play. Your brain becomes more active the more you play. During your commute, before you sleepâ€¦ enjoy downtime with brain training. The rules are extremely simple. Just fill in all of the blocks using only one line.