65 generators
One engine, four lanes. Every preview below was rendered by the engine at seed 0xa11ce — click through for how each one works, its guarantees, and its history.
Designs
Mandalas, kolams, tilings and flow fields — colourable line art with mathematical bones.
Border
Ornamental borders — the seven frieze groups over the motif library
Celtic Plait
An interlaced plait: cords passing over and under, with cells that turn them back
Colour by Number
Colour by number — a numbered grid that colours into a symmetric design
Contour
Contour lines — a seeded heightfield's level sets, terrain-map style
Flow Field
Evenly spaced streamlines through a noise field
Harmonograph
Damped pendulum figures, with frequencies nudged off exact ratios so they precess
Hitomezashi
Hitomezashi stitch patterns — two bit sequences, emergent two-colourable loops
Kolam
Sikku and pulli kolam: continuous loops woven around a dot lattice
Labyrinth
Unicursal labyrinths — one corridor, classical or seeded, proven single-path
L-System
Ferns, vines and fractals from stochastic L-systems, with fillable leaves
Mandala
Circular, square and polygonal rosettes from a symmetric fundamental domain
Circle Packing
A page of circles, each grown until it touches a neighbour or the wall
Phyllotaxis
Phyllotaxis — golden-angle floret spirals, sunflower heads and petal disks
Spirograph
Layered spirograph roulettes, closed exactly by their tooth ratios
String Art
String art — modular chord envelopes, cardioids and their kin
Tessellation
Interlocking tiles whose wiggly edges match exactly, laid by translation or glide
Tiling
Islamic star, Truchet, Penrose and Cairo tilings as line art
Voronoi
Cellular and stained-glass patterns from relaxed Voronoi cells
Zentangle
Zentangle — a partitioned page, each region filled with its own tangle
Mazes
Square, triangular, hexagonal and circular mazes carved by eleven algorithms, with answer keys.
Logic puzzles
Sudoku, nonograms, slitherlink and twenty more — every one proven uniquely solvable.
ABC Path
ABC Path — A to Y, each letter touching the next, guided by edge clues
Akari (Light Up)
Place bulbs to light every cell, with no two bulbs shining on each other
Binairo
Binairo — balance two symbols with no three alike and no twin lines
Dot-to-Dot
Connect the dots — parametric silhouettes with verified dot separation
Fillomino
Partition the grid into regions, each cell holding the size of its own
Futoshiki
Futoshiki — a Latin square constrained by printed inequality signs
Spiral Galaxies
Spiral Galaxies — partition into whirls, each symmetric about its dot
Hashi (Hashiwokakero)
Join the islands with bridges, clued by how many each one takes
Heyawake
Paint each room its number of cells, keeping white connected and never running through three rooms
Hitori
Shade cells until no number repeats in any row or column
Kakurasu
Kakurasu — shade cells so every line sums to its position clue
Kakuro
Cross-sums with combination reasoning and proven uniqueness
KenKen
Fill a Latin square so each cage reaches its target by its operation
Kuromasu (Kurodoko)
Black out cells so every number counts the white cells its own cell can see
LITS
Shade one L, I, T or S tetromino in every region, all joined, with no two alike touching
Logic Grid
Logic grids with relational clues, minimised to the smallest sufficient set
Masyu
One closed loop turning at black circles and running straight through white
Nonogram
Picture logic puzzles, proven solvable by line reasoning alone
Numberlink
Join each numbered pair with a path, filling every cell
Numbricks
Numbricks — 1 to n² snaking through the grid, one step at a time
Nurikabe
Shade a connected wall around numbered islands, with no 2x2 block shaded
Ripple Effect
Fill each room with 1 to its size, keeping equal values further apart than themselves
Shakashaka
Place half-cell triangles so every white area left over is a rectangle
Shikaku
Partition a grid into rectangles, one numbered clue per rectangle
Skyscrapers
Skyscrapers — a Latin square read from its edges by visibility counts
Slant (Gokigen Naname)
Fill every cell with a diagonal, matching the corner counts and closing no loop
Slitherlink
Draw one closed loop, clued by how many edges each cell touches
Star Battle
Star Battle — a star in every row, column and region, none touching
Sudoku
Sudoku with proven uniqueness and technique-ladder difficulty
Suguru
Suguru — each region counts itself, touching cells never match
Tents
Tents — pitch one tent beside every tree, none touching, counts on the edges
Yajilin
Yajilin — arrows count hidden shaded cells, one loop threads the rest
Word puzzles
Word searches, crosswords, cryptograms and ladders — built from curated wordlists and quotes.
Acrostic
Acrostic — unscramble each row, read the initials for the hidden word
Codeword
Codeword — a filled crossword in cipher, unique against its vocabulary
Crossword
Symmetric crossword grids filled from a clued wordlist
Cryptarithm
An addition in letters, with exactly one way to read it as digits
Cryptogram
Substitution ciphers over public-domain quotes, with a frequency table
Drop Quote
Drop quote — fallen phrases, proven to reassemble one way
Word Jumble
Word jumble — anagram-unique scrambles feeding a circled final answer
Sum Search
Sum Search — find the digit runs that add to each target, uniquely
Word Fit (Criss-Cross)
Criss-cross fill-in puzzles with a proven-unique arrangement
Word Ladder
Word ladder — Carroll's doublets, with the shortest path proven unique
Word Search
Themed word searches with distribution-matched filler and answer keys
Word Wheel
Word Wheel — find every word using the central letter, and the nine