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Mochi Sudoku

Fill the candy grid so every row, every column and every little box holds each number exactly once — the classic sudoku, made soft and sweet.

About Mochi Sudoku

Mochi Sudoku is the timeless Japanese number-placement puzzle dressed in candy. Each board is a square grid split into smaller boxes, pre-seeded with a scatter of glossy given numbers, and your job is to fill every empty cell so that each number appears exactly once in every row, once in every column, and once in every box. Nothing is added or multiplied — sudoku is pure logic, a process of looking at what a row, column and box already contain and deducing what is still missing. The grids start tiny and friendly at 4x4, grow to a roomy 6x6, and build all the way up to the full 9x9 that sudoku is famous for.

You never type on a keyboard or hunt for a tiny cell. You pick a number up from the pad beneath the board and it stays in your hand, so you can tap cell after cell to drop it wherever it belongs — and the instant you pick a number, every cell already holding it lights up so you can see where it still has room. Tap a cell that already shows that number to lift it back out, or pick up the erase chip and tap cells to wipe them. You can also tap any cell on its own to light up its row, column and box and see exactly what it shares. Given numbers from the puzzle are locked and shown in bright white so you always know which ones are yours to change. The moment a number you place clashes with the same number already sitting in its row, column or box, both glow red, so a mistake is caught the instant you make it instead of unravelling twenty moves later.

Every board is no-fail and built to be fair. There are no timers and no lives — you can erase, rethink and refill as often as you like — and crucially every single puzzle is generated to have exactly one solution, so there is always a clean path of pure deduction to the end with no guessing required. If you get truly stuck, a Hint in the settings panel fills one correct cell for you, and Clear wipes your entries back to the original givens. Place the final number correctly and the grid celebrates with a flash, a little shake, sparkles and a five-note jingle before the level card slides in with three stars.

How to play Mochi Sudoku

Look at the candy grid: some cells already hold bright given numbers — those are fixed clues you build around.
Tap a number on the pad below the board to pick it up — its chip glows and every cell already holding that number lights up.
Tap any empty cell to drop that number in; it stays picked, so keep tapping cells to place it again and again.
Tap a cell that already holds the picked number to lift it back out, or pick up the erase chip and tap cells to wipe them.
If a number turns red it clashes with the same number in its row, column or box — clear it and try another.
Work through the board until every row, column and box holds each number exactly once; it then completes on its own, awards three stars, and offers Next.

Controls

Input	Action
`Tap a number on the pad`	Pick it up as the pen — it stays picked and every cell holding it lights up
`Tap cells with a number picked`	Drop that number into each cell; tap a cell that already holds it to clear it
`Tap the erase chip, then tap cells`	Wipe each cell you tap — the erase pen stays picked too
`Tap the picked chip again`	Put the pen down
`Tap a cell with no pen picked`	Lights up its row, column and box so you can see what it shares (and lets a desktop keyboard type into it)
`Number keys` / `Backspace (desktop)`	Type into or erase the selected cell; arrow keys move the selection
`Settings (gear) button`	Open level select, the sound toggle, a Hint, and Clear

Tips & strategy

Hunt for the most-filled rows, columns and boxes first — a line that already has most of its numbers often leaves just one cell where a missing number can legally go.
Pick a single number and sweep the whole board for it: see which boxes still need that number, then narrow down its cell by ruling out the rows and columns that already use it.
Use the highlight — pick a number up from the pad and every copy of it lights up, making it easy to sweep that one number across the board and see where it still has room.
A cell whose row, column and box together already show every number but one must be that missing number; these 'forced' cells are the safe moves that open up the rest.
Lean on the red clash warning while learning: place a candidate, and if it lights red you have instantly learned it cannot go there.
Smaller 4x4 and 6x6 boards are perfect for learning the logic before you tackle the full 9x9 in the later worlds.
Stuck with no safe move in sight? Tap Hint in settings to reveal one correct cell — often that single number is enough to unlock a whole region.

Game features

Real sudoku rules with a touch-native pen flow — pick a number once and tap it across the whole board, no keyboard, no fiddly typing, perfect for phones and tablets.
20 hand-tuned levels across five candy worlds — Berry, Citrus, Mint, Ocean and Galaxy — ramping from a gentle 4x4 through 6x6 up to the full 9x9.
Endless mode past level 20 that generates fresh 9x9 boards forever, thinning the givens as the number climbs so the puzzles keep getting tougher instead of repeating.
Every board is generated with a guaranteed unique solution, so there is always a clean line of pure logic to the finish and never a need to guess.
Instant red-clash feedback the moment a number repeats in a row, column or box, plus a tap-to-highlight any number across the whole grid.
Friendly no-fail flow: no timers or lives, erase and refill freely, a one-tap Hint that fills a correct cell, and Clear to reset to the givens.
Soft candy art, per-number chime, and a sparkly five-note victory with flash and shake on every solved grid.
Saved progress and three-star wins per level in a level-select grid, kept privately in your own browser with a one-tap mute.

Game details

Title: Mochi Sudoku
Genre: Logic puzzle
Players: 1 player
Controls: Tap a number on the pad to pick it up, then tap cells to drop it in — the number stays picked so you can place it again and again (mouse or touch); tap a filled cell to clear it, or pick up the erase chip
Platforms: Web browser, Android, iOS (no download)
Developer: Anime Mochi
Released: 2026
Last updated: June 2026
Price: Free to play

Frequently asked questions

How do you play sudoku?

Fill the grid so every row, every column and every box contains each number exactly once. In Mochi Sudoku you tap a number on the pad below the board to pick it up, then tap each empty cell where it belongs — the number stays picked so you can place it again and again. The given numbers are fixed; the rest are yours to deduce. There is no math — sudoku is purely about which number is still missing from a row, column or box.

Do I need to be good at math?

Not at all. Sudoku never adds, subtracts or multiplies anything — the numbers are just nine different symbols. Every move is logic: looking at what a row, column and box already contain and working out what is left. That is why the early 4x4 and 6x6 worlds are great for young players and beginners.

What do the different grid sizes mean?

Mochi Sudoku starts at 4x4 (boxes of two-by-two), grows to 6x6 (boxes of two-by-three), and builds up to the classic 9x9 (boxes of three-by-three). Smaller grids use fewer numbers and are quicker to solve, so the worlds act as a gentle ramp from first-timer to full sudoku.

Why did my number turn red?

Red means that number already appears in the same row, column or box — sudoku's one rule broken. Nothing is lost: just tap that cell again to lift the number out (or pick up the erase chip and tap it), and place a different one. The instant warning is there to help you learn, not to punish.

Is every puzzle solvable without guessing?

Yes. Each board is generated to have exactly one solution, which means there is always a logical path to the end — you never have to guess and hope. If you reach a point where you cannot see the next step, the Hint button in settings will reveal one correct cell to get you moving again.

What does the Hint button do?

Hint fills one currently-empty cell with its correct number, chosen from the puzzle's unique solution. It is there for when you are genuinely stuck; use it as little or as often as you like — completing a level always awards three stars either way.

How many puzzles are there?

Twenty hand-tuned levels span five candy worlds, ramping from an easy 4x4 up to the full 9x9 with steadily fewer given numbers. Clear all twenty to unlock Endless mode, which builds fresh 9x9 boards forever and keeps thinning the clues so the challenge keeps climbing.