Block 21 is a free online block puzzle game where you tap or click groups of three or more same-colored blocks to clear them from the board and work your way toward the ultimate goal: reaching block 21. The mechanic is simple to pick up but the strategy runs deep as the board fills up and your options shrink fast. Every click counts, and one wrong move can leave you stuck with isolated blocks and no way forward.

What makes Block 21 addictive is the constant tension between clearing big groups for high points and setting up the board for your next move. Larger clusters give you more control, so patience pays off here. The colorful HTML5 gameplay runs smoothly in any browser without plugins or downloads, making it easy to jump in for a quick session or grind through for a high score. The puzzle scales in difficulty naturally as the board becomes more crowded, keeping each round fresh.

Block 21 is a great fit for fans of color matching games, brain teasers, and casual logic puzzles. If you enjoy games like Candy Crush mechanics stripped down to pure strategy, or classic tile-matching challenges, this game will click with you. It also works perfectly on mobile and desktop. Players searching for free block puzzle games, HTML5 brain games, color match puzzles, or no-download logic games will find exactly what they need right here. Play Block 21 free and see how far you can go.