Logic
12x12 Giant Sudoku (PuzzleMadness)
A 12x12 sudoku using 1 to 9 and A to C, one new grid a day.
PuzzleMadness games
PuzzleMadness is a UK puzzle site with a dated daily puzzle for each of more than eighty puzzle types, most in several difficulties: classic, killer and dozens of variant sudokus, Kakuro, Hashi, Slitherlink, Nonograms, Star Battle and many more logic grids, plus mazes and a word search. Scores feed monthly and all-time leaderboards, and every past day stays in the archive.
All puzzlemadness games
Logic
16x16 Giant Sudoku (PuzzleMadness)
A 16x16 sudoku using 1 to 9 and A to G, one new giant grid a day.
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Addition Sudoku (PuzzleMadness)
A sudoku with grey blocks of cells that work as written-out addition sums.
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Anti King Sudoku (PuzzleMadness)
A sudoku where the same digit may never sit in two cells that touch, not even diagonally.
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Anti Knight Sudoku (PuzzleMadness)
A sudoku where the same digit may never sit a chess knight's move away from itself.
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Argyle Sudoku (PuzzleMadness)
A sudoku with eight diagonal lines in an argyle pattern, and no digit repeats along any of them.
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Arrow Sudoku (PuzzleMadness)
Sudoku with arrows: the circled digit equals the sum along its stalk.
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Ballsort (PuzzleMadness)
Move coloured balls between tubes until every tube holds a single colour.
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Battleships (PuzzleMadness)
Find the hidden fleet from the row and column counts, one grid a day.
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Between Line Sudoku (PuzzleMadness)
A sudoku with lines between two circles: every digit on the line lies strictly between the circled ends.
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CellBlocks (PuzzleMadness)
Split the grid into rectangles, each holding one number equal to its area.
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Center-Dot Sudoku (PuzzleMadness)
Sudoku where the nine centre squares of the boxes form an extra region.
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Consecutive Line Sudoku (PuzzleMadness)
A sudoku with grey lines where each digit is one more or one less than the next along the line.
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Consecutive Sudoku (PuzzleMadness)
Sudoku where a thick bar between two squares means their digits differ by one.
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Dominosa (PuzzleMadness)
Split a grid of numbers into a full set of dominoes, each pair used once.
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Entropic Line Sudoku (PuzzleMadness)
A sudoku with lines where any three cells in a row hold one low, one medium and one high digit.
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Entropy Sudoku (PuzzleMadness)
A sudoku where every 2x2 square of cells must hold a low, a medium and a high digit.
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Factor Line Sudoku (PuzzleMadness)
A sudoku with lines from a circle: every digit on the line must divide the circled digit exactly.
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Fillomino (PuzzleMadness)
Divide the grid into groups where each number is the size of its group.
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Frame Sudoku (PuzzleMadness)
A sudoku framed by sums: each clue is the total of the first three digits from that edge.
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Futoshiki (PuzzleMadness)
Fill a Latin square that obeys every greater-than and less-than sign.
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German Whisper Line Sudoku (PuzzleMadness)
A sudoku with grey lines where neighbouring digits along a line differ by at least 5.
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Greater Than Sudoku (PuzzleMadness)
A sudoku solved from greater-than and less-than signs between squares.
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Hashi (PuzzleMadness)
Link every island with bridges so each has its number, all in one network.
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HexaBlocks (PuzzleMadness)
Fit every hexagon-shaped piece into the grid with no gaps and no overlaps.
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Hidoku (PuzzleMadness)
Fill in the numbers so they run from 1 to the last in one chain of touching squares.
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Hitori (PuzzleMadness)
Shade out repeated numbers so no row or column shows a number twice.
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Hyper Sudoku (PuzzleMadness)
Sudoku with four extra shaded 3x3 regions that must also hold 1 to 9.
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Jigsaw Sudoku (PuzzleMadness)
Sudoku with nine irregular regions in place of the 3x3 boxes, new every day.
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Kakurasu (PuzzleMadness)
Shade cells so each row and column adds up to its total, counting each cell by its position.
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Kakuro (PuzzleMadness)
A daily cross-sum grid: make every run add up to its clue with no repeated digit.
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Kids Sudoku (PuzzleMadness)
Small 4x4 and 6x6 sudokus for children and beginners, one a day.
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Killer Sudoku (PuzzleMadness)
A daily sudoku with no given digits, only dotted cages and their sums.
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Kropki Sudoku (PuzzleMadness)
A sudoku with dots between cells: white for consecutive digits, black for one double the other.
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Light Up (PuzzleMadness)
Place bulbs so every white square is lit and no bulb shines on another.
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Lits (PuzzleMadness)
Shade one L, I, T or S tetromino in every region so the shading joins up with no 2x2 blocks.
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Little Killer Sudoku (PuzzleMadness)
A sudoku with arrowed sums outside the grid, each giving the total of a diagonal.
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Lockout Line Sudoku (PuzzleMadness)
A sudoku with lines between two diamonds: the ends differ by at least 4 and the middle stays outside their…
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Masyu (PuzzleMadness)
Draw one loop through every pearl: turn on black, go straight on white.
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Mathdoku (PuzzleMadness)
A daily KenKen-style grid: fill each row and column and hit every cage's target.
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MathGrid (PuzzleMadness)
Move the numbers and signs under the grid into place so every sum works.
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Maze (PuzzleMadness)
Guide your avatar through the day's maze to the flag.
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Minesweeper (PuzzleMadness)
A daily logic Minesweeper: work out every mine from the number clues.
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Network (PuzzleMadness)
Rotate the tiles until every cell connects to the power source with no dead ends.
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Nonograms (PuzzleMadness)
Colour the grid from the run clues on every row and column to reveal a picture.
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NoriNori (PuzzleMadness)
Shade exactly two cells in every region, with the shaded cells forming dominoes that never touch.
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Numberlink (PuzzleMadness)
Join each pair of matching numbers with lines that fill every square.
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NumberMaze (PuzzleMadness)
Draw one line from 1 through every number in order, covering every open cell.