Block 21 is a free Puzzle game you can play instantly in your browser, with no download and no registration. How to play: Tap the screen or click the mouse. It renders at 1280 by 720 pixels and scales to your window. It joined SaGo Games on October 29, 2026. It is an HTML5 build, so it loads in any modern desktop or mobile browser.
Tap/click on a group of three or more blocks with the same color. Get block 21. Have fun!