https://zeloku.com/ https://zeloku.com/illustrations/hero-sudoku.svg Sudoku, beautifully done — Zeloku hero illustration Editorial illustration of a 9×9 Sudoku board floating in warm light with a coffee cup and pencil, the Zeloku homepage hero. https://zeloku.com/daily-sudoku/ https://zeloku.com/illustrations/daily-ritual.svg Daily Sudoku ritual — calendar and morning coffee A calendar page with today highlighted in sage and a coffee cup — the daily Sudoku ritual on Zeloku. https://zeloku.com/kids-sudoku/ https://zeloku.com/illustrations/kids-sudoku.svg Kids Sudoku illustration — 4×4 with stars and crayons A playful 4×4 Sudoku grid surrounded by clouds, sun and crayons, designed for children aged 5 to 10. https://zeloku.com/sudoku-for-beginners/ https://zeloku.com/illustrations/audiences.svg Sudoku for every age — kids, teens, adults and seniors Four Sudoku cards illustrating the audiences Zeloku serves — kids 4×4, teens 6×6, adults 9×9 and seniors large-print 9×9. https://zeloku.com/learn/ https://zeloku.com/illustrations/techniques.svg Sudoku techniques diagram — hidden single, naked pair, X-Wing A Sudoku board diagram with an X-Wing in amber, a hidden single in sage and a naked pair tag — the four techniques covered on Zeloku. https://zeloku.com/sudoku-solver/ https://zeloku.com/illustrations/solver.svg Sudoku solver — step-by-step logical reasoning A Sudoku board with a magnifying glass on a single cell, paired with a four-step legend describing how the Zeloku solver reasons. https://zeloku.com/printable/ https://zeloku.com/illustrations/printable-pack.svg Printable Sudoku booklet illustration Three A4 sheets fanned with 9×9 grids and a pencil — illustrating Zeloku's free printable Sudoku PDF booklets. https://zeloku.com/sudoku-for-adhd/ https://zeloku.com/illustrations/sudoku-for-adhd.svg Sudoku for ADHD — focus illustration A 9×9 Sudoku grid with a single highlighted cell glowing amber, surrounded by faded notification icons being filtered out — representing focus for an adult with ADHD. https://zeloku.com/sudoku-for-memory-loss/ https://zeloku.com/illustrations/sudoku-for-memory-loss.svg Sudoku for memory loss — brain and grid illustration A 9×9 Sudoku board overlaid on a stylised brain silhouette with delicate neural arcs, in Zeloku's sage and amber palette — daily Sudoku as a working-memory exercise. https://zeloku.com/sudoku-before-bed/ https://zeloku.com/illustrations/sudoku-before-bed.svg Sudoku before bed — evening wind-down illustration A Sudoku board on a bedside table, lit by a warm lamp with a crescent moon and stars in a darkened window — a calm evening Sudoku ritual. https://zeloku.com/killer-sudoku-rules/ https://zeloku.com/illustrations/killer-sudoku.svg Killer Sudoku rules — cage and sum illustration A 9×9 Killer Sudoku grid with dashed cage outlines and small cage-sum numerals in the top-left of each cage, with sage and amber palette callouts for the 45 rule and the no-repeat-in-cage rule. https://zeloku.com/hardest-sudoku-ever/ https://zeloku.com/illustrations/hardest-sudoku.svg The hardest Sudoku ever — Everest illustration Arto Inkala's 2012 Sudoku against a dark slate-and-amber backdrop with a small Everest peak motif — the world's hardest published Sudoku puzzle. https://zeloku.com/sudoku-illustrations/ https://zeloku.com/illustrations/hero-sudoku.svg Sudoku illustration gallery — Zeloku The full Zeloku Sudoku illustration set — daily, kids, audiences, techniques, solver and printable. https://zeloku.com/illustrations/daily-ritual.svg Daily Sudoku ritual illustration https://zeloku.com/illustrations/kids-sudoku.svg Kids Sudoku illustration https://zeloku.com/illustrations/audiences.svg Sudoku audiences illustration https://zeloku.com/illustrations/techniques.svg Sudoku techniques illustration https://zeloku.com/illustrations/solver.svg Sudoku solver illustration https://zeloku.com/illustrations/printable-pack.svg Printable Sudoku booklet illustration https://zeloku.com/illustrations/sudoku-for-adhd.svg Sudoku for ADHD illustration https://zeloku.com/illustrations/sudoku-for-memory-loss.svg Sudoku for memory loss illustration https://zeloku.com/illustrations/sudoku-before-bed.svg Sudoku before bed illustration https://zeloku.com/illustrations/killer-sudoku.svg Killer Sudoku rules illustration https://zeloku.com/illustrations/hardest-sudoku.svg Hardest Sudoku ever illustration