Patch Mosaic is a free online rectangle-partition puzzle you can play instantly in your browser, no download, no account, and unlimited boards any time you like. Every board is scattered with numbered clue cells, and your goal is to divide the entire grid into rectangular patches so that every patch contains exactly one clue and its area — the number of cells it covers — matches that clue's number exactly. Press down on any cell and drag to another to draw a rectangular patch between them; a valid patch locks in with its own color, while dragging over a cell that is already part of another patch or across zero or more than one clue is rejected. Tap an already-placed patch to lift it back up and redraw it a different size. Play through 15 levels that grow the board from a gentle 5×5 up to a demanding 10×10 grid, with the largest allowed patch size growing too, so later levels lean on bigger, chunkier rectangles whose exact dimensions are much harder to read at a glance. It is a free patch mosaic puzzle unlimited, generated fresh for every level with no daily wait, no login, and no limit on how many boards you piece together in one sitting.
How to play Patch Mosaic
- The board is scattered with numbered clue cells. Your job is to divide the whole grid into rectangular patches, one per clue.
- Press down on any cell and drag to another cell to draw the rectangle between them, then release to place it.
- A patch is only accepted if it contains exactly one numbered clue and does not overlap any patch you have already placed.
- A placed patch does not have to be the right size right away — but its area (the number of cells it covers) must eventually match its clue's number to count as correct.
- Tap any cell inside an already-placed patch (without dragging) to lift that patch back up so you can redraw it.
- The board is solved the instant every cell is covered by a patch and every patch's area matches its clue.
Tips
- Start with clues that sit near a corner or edge — their possible rectangle shapes are far more limited than clues in the open middle of the board.
- A patch that visibly overlaps another or leaves an odd-shaped gap behind is almost always wrong, even if its own area is correct — check the cells around it, not just the number.
- When two clues are close together, work out how much space is physically left for each of them before committing to either rectangle's shape.
- On later levels with bigger maximum patch sizes, sketch the board's leftover empty space first — an oddly-shaped leftover region often has only one rectangle that can possibly fill it.
FAQ
Is Patch Mosaic free to play?
Yes. It's a free mosaic puzzle game in your browser with no download, no account, and no in-game purchases.
What are the rules?
Divide the whole grid into rectangular patches so every patch contains exactly one numbered clue and its area (the number of cells it covers) matches that clue's number, with no overlaps and no gaps.
Is there a new puzzle every day?
No — boards are generated fresh for each level using a seeded layout, and you can replay any unlocked level as many times as you like instead of waiting for a daily reset.
Does Patch Mosaic work on mobile?
Yes — press and drag your finger across the grid to draw each patch, so it plays the same on phones, tablets, and desktop with no download required.
Is Patch Mosaic the same as a Shikaku puzzle?
Yes — Patch Mosaic follows the classic Shikaku (rectangle-division) ruleset: divide the grid into rectangles so each one contains exactly one numbered clue and covers exactly that many cells. It is not a picture-reveal mosaic or nonogram — the "mosaic" here refers to the colorful patchwork of rectangles you build, not a hidden picture.
How many levels does Patch Mosaic have?
There are 15 levels. The board grows from a 5×5 grid at Level 1 up to a 10×10 grid at Level 15, with the largest allowed patch size growing too, for chunkier, trickier rectangles.