If the game isn't starting, click on the game screen once with your mouse. Browsers sometimes require a "focus" click before registering keyboard inputs.
For those interested in puzzle games with a strong focus on aesthetics and engaging gameplay, Tetris Effect is definitely worth checking out. If "Echalk" is on your radar, you might need to dig deeper into gaming forums, social media, or specific game platforms to find more information about its gameplay and where to play it.
Clearing four lines at once yields significantly more points than clearing singles or doubles. In Echalk, point multipliers are key to a high score.