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Mochi Rect

Mochi Rect is a free, cozy Shikaku puzzle: drag across a candy grid to carve it into rectangles so every box wraps exactly one number, and that number is how many cells the box covers.

About Mochi Rect

Mochi Rect is a clean, modern take on Shikaku, the beloved Japanese pencil-and-paper logic puzzle (sometimes called 'divide by box'). You start with a grid of cells dotted with glossy numbered candy chips, and your job is to slice the whole grid into rectangles. The rule is simple but satisfying to untangle: each rectangle must contain exactly one number, and that number tells you how many cells the rectangle must cover. A chip showing six wants a rectangle of six cells — maybe two-by-three, maybe one-by-six — and the puzzle is solved the moment every cell on the board belongs to one and only one tidy rectangle.

Everything is drawn by dragging. Press on a cell, pull to another, and a live preview shows the rectangle's running cell count: it glows in your world's candy color when the box holds one matching number, and turns amber or red when the count is off or the box grabs zero or two chips. Mochi Rect is completely no-fail — there are no timers, no lives, and no wrong move you cannot take back. A box that overlaps an old one simply replaces it, a quick tap lifts a box you want gone, and you can wipe the board and start fresh whenever an idea clicks. Solve the layout and a confetti burst pops every rectangle to life.

How to play Mochi Rect

Look at the numbered candy chips scattered across the grid — each number is the size of the rectangle that must surround it.
Press on a cell and drag to another to draw a rectangle; the live preview counts the cells you are covering.
Release to lock the rectangle in. It glows in the world's color when it holds one chip whose number matches the box's cell count.
Tap a single rectangle to lift it off, or just drag a new box over an old one to replace it.
Keep carving until every cell on the board is inside exactly one rectangle and each chip sits in its own correctly sized box.
When the whole grid is tiled correctly the level completes on its own — collect your three stars and tap Next for the following puzzle.

Controls

Input	Action
`Drag (touch or mouse)`	Draw a rectangle from the first cell to the last
`Tap a rectangle`	Remove that committed rectangle
`Drag over a rectangle`	Replace any boxes it overlaps with the new one
`R or Backspace`	Clear every rectangle and start the board fresh
`Space or Enter`	On the win card, jump to the next level
`Settings button`	Open level select, the sound toggle, and Clear all

Tips & strategy

Start from the numbers near the edges and corners — a chip in a corner has very few ways its rectangle can stretch, so it is usually the safest first box.
A small number is your friend: a 2 or a 3 has only one or two possible shapes, and locking those in carves away cells that pin down the bigger rectangles.
Factor the number to find the shapes it allows — a 6 can only be one-by-six, two-by-three, three-by-two, or six-by-one, so picture which of those actually fits.
Watch the live count while you drag; if the box turns amber it means a single chip is inside but the size is wrong, so just nudge an edge until it glows.
When a region only has one chip left in it, the leftover empty cells around it must all belong to that chip's rectangle — let the gaps tell you the shape.
If you paint yourself into a corner, tap a box to lift it or press R to clear the whole board; nothing is lost and re-drawing is part of the fun.

Game features

Authentic Shikaku rules: tile the entire grid into rectangles, one number per box, area equal to the number.
20 hand-tuned levels across five candy worlds — Berry, Citrus, Mint, Ocean, and Galaxy — ramping from a roomy five-by-five up to a dense ten-by-ten.
An endless mode that keeps generating fresh, always-solvable boards past the curated set, ramping in size and density so it never goes flat.
Every puzzle is built from a real solution and validated before it loads, so there is always a clean answer — no impossible boards.
A friendly no-fail design: no timers, no lives, instant undo by tap, replace-on-overlap drawing, and a one-touch Clear all.
A live drag preview that counts cells and color-codes each box green, amber, or red so you can read your move before you commit it.
A level-select grid that tracks your progress, plus a satisfying three-star, confetti-popping win on every solve.
Synthesized candy sound effects (boxes chime by size) with a one-tap mute, and it plays instantly on phone, tablet, or desktop with no download.

Game details

Title: Mochi Rect
Genre: Puzzle
Players: 1 player
Controls: Drag to draw rectangles (mouse or touch)
Platforms: Web browser, Android, iOS (no download)
Developer: Anime Mochi
Released: 2026
Last updated: June 2026
Price: Free to play

Frequently asked questions

What is Shikaku?

Shikaku is a Japanese logic puzzle, also called 'divide by box.' You split a grid into rectangles so that each rectangle contains exactly one number and covers exactly that many cells. Mochi Rect is a cute, drag-to-draw version of it.

Is Mochi Rect free to play?

Yes, completely free. It runs right in your browser with nothing to buy and no account to create — just open it and start carving rectangles.

Do I need to download or install anything?

No. Mochi Rect loads instantly as a web game. You can optionally add Anime Mochi to your home screen for a shortcut, but there is no app-store download.

Can I play on my phone?

Absolutely. Mochi Rect is touch-first — press and drag with your finger to draw a rectangle, tap one to remove it. It plays the same on Android and iPhone as it does with a mouse on desktop.

Can I ever get stuck or lose?

Never. There are no timers or lives, and every board is built from a guaranteed solution. If a layout goes sideways, tap a rectangle to remove it or press R to clear the board and try a fresh approach.

Does the game keep going after level 20?

Yes. After the 20 hand-tuned levels you unlock an endless mode that generates new puzzles forever. The boards keep growing larger and denser as the level number climbs, so the challenge keeps building. Your progress is saved privately in your own browser.