Play Calcudoku online for free. Solve an arithmetic sudoku puzzle using logic, numbers, and cage operations.
3x3 to 9x9Size-based difficultyArithmetic cages
Try Calcudoku if you enjoy Sudoku-style logic with a little arithmetic.
Play CalcudokuLogic Puzzles
Explore logic-first puzzle games beyond Sudoku. Play Queens for visual deduction, 2048 for number-merging strategy, or Nonogram for picture logic with row and column clues.
Featured Logic Puzzles
Connect the numbered checkpoints in order with one continuous path. Move only up, down, left, or right, visit every square exactly once, and save the final checkpoint for last.
5×5 – 8×8Easy – ExpertDaily
Every published puzzle is checked by a solver that enforces checkpoint order, orthogonal movement, full-board coverage, and single-use squares. The counter stops after finding a second route; only puzzles with exactly one solution are accepted. The completed path is kept out of the public puzzle data sent with the page.
Play Number PathSolve a 9×9 Sudoku with one extra rule: digits must increase strictly from every thermometer bulb to its tip. Play free online and use each path's limits to make clear logical deductions.
9×9Easy – ExpertAlso known as Thermometer Sudoku
A path's length immediately limits its digits. On a five-cell thermometer, the bulb cannot exceed 5 because four larger values must still fit after it. The tip cannot be lower than 5 for the opposite reason. More generally, the first cell of a length-L path is at most 10 minus L, and each later position inherits a tighter minimum.
Play Thermo SudokuPlace buildings of different heights and use the skyline clues to solve each Skyscrapers puzzle.
4×4 – 6×6Easy – HardSkyline number logic
In the line 2, 1, 4, 3, 5, a viewer from the left sees buildings 2, 4, and 5. Height 1 is hidden by 2, while height 3 is hidden by 4, so the left clue is 3. Looking from the opposite side can produce a different count because the buildings are encountered in reverse order.
Play SkyscrapersPlace one tent beside every tree, match the clues around the grid, and keep all tents from touching, even diagonally.
6×6 – 12×12Easy – ExpertDaily
A 6×6 puzzle is a quick introduction, 8×8 offers a balanced everyday game, and the 10×10 and 12×12 boards support longer chains of deductions. Size and difficulty are selected independently.
Start Tents & TreesPlace exactly two stars in every row, column, and irregular region. Stars cannot touch, even diagonally. Start with the featured 10×10 puzzle or switch to the one-star introduction.
1-Star / 2-Star6×6 – 12×12Daily
Each unit needs two stars. Locked pairs, combined row capacity, and interactions between neighboring regions become central to the solve.
Play Star BattleFill the grid with 0s and 1s. Balance every row and column, avoid three matching digits in a row, and make every completed line unique.
6×6 / 8×8 / 10×10Easy – ExpertDaily
The 6×6 board is a quick introduction, 8×8 offers the most balanced everyday challenge, and 10×10 gives experienced players longer chains of deductions. Every available size uses the same core rules.
Start Binary PuzzlePlace cats in colorful regions while keeping rows, columns, and touching squares conflict-free.
260 levelsRegion logicMobile friendly
A cute cat logic puzzle for players who enjoy Queens-style deduction and clean visual rules.
Play Cat SudokuStart with an approachable Kakuro puzzle built for learning across and down sums. Fill digits 1-9, avoid repeats in each run, and use the clues to build confidence one cell at a time.
Easy / Medium / HardCross SumsDaily Kakuro
Kakuro feels familiar to Sudoku players, but progress comes from sum combinations and crossing runs instead of boxes and givens.
Play Easy KakuroA colorful logic puzzle where every row, column, and region must contain exactly one queen, and queens may not touch diagonally.
7×7 to 12×12 boardsRow · Column · Region · Diagonal TouchVisual deduction
Play a clean, modern Queens board online with responsive controls and a puzzle flow built for careful reasoning.
Play QueensSlide numbered tiles across a clean 2048 board. Merge matching numbers, manage open space, and choose 4x4, 5x5, or 6x6 play.
4x4, 5x5, 6x6Easy and hardNumber strategy
Play 2048 online with keyboard, swipe, and tap controls built for quick logic sessions.
Play 2048Solve picture logic puzzles with row and column clues. Fill black cells, mark X spaces, and choose 5x5, 10x10, or 15x15 boards.
5x5, 10x10, 15x15Easy and hardPicture logic
Play Nonogram online with fill and X marking, completed-line highlights, and browser-friendly controls.
Play NonogramFind hidden words by dragging through the letter grid. Choose a theme, pick a difficulty, use hints, or print a puzzle for later.
Easy, Medium, Hard31 themesTouch friendly
Word Search is a letter-grid puzzle where you find hidden words by scanning rows, columns, and diagonals.
Play Word SearchSolve free online Crossword puzzles built for casual players, families, classrooms, and word-game fans who want fair clues without newspaper-level difficulty.
Mini, Easy, MediumFree onlineMini is a compact 5x5 crossword for a quick word puzzle.
Crossword is a classic word puzzle where each answer fits into a numbered grid and crosses with other answers.
Play Crossword