About Block 21
Block 21 is a compact color-matching puzzle based on groups of blocks. Your job is to tap or click a connected group containing three or more blocks of the same color.
The rules are brief, but choosing a group still involves visual judgment. Look for color clusters, decide which valid group to remove, and keep interacting with the board while working toward the Block 21 goal.
How to Play Block 21
Tap the screen or click the mouse to interact with the blocks.
Find a group containing at least three blocks of one color.
Tap or click a valid same-color group.
Continue selecting groups as you work toward Block 21.
Tips & Tricks
- 1Search for groups of three or more before clicking, because a lone block is not a valid target.
- 2Compare the available color clusters and choose a clear group rather than guessing.
- 3Recheck the board after each selection so you do not overlook another same-color group.
Game Info
- Category
- Puzzle
- Platform
- Web browser
- Price
- Free
- Added
- Oct 26, 2026
- #Block
- #Brain
- #HTML5
- #Logic
- #Puzzle
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