Fullscreen and press the green flag. Instructions are in game. (This is just a modification of my Tetris Blitz game...) If you are looking for a relaxing game instead, then go to this link: https://scratch.mit.edu/projects/362502959/
Thanks to the user ubrecma for the project Tetris V.0.1, which I remixed to make this. Credit to Hudson Soft for the original game.