Gridwell: Sudoku & Killer

Every hint teaches you the technique to solve it yourself — never just the answer. Classic & Killer Sudoku, fully offline. Pay once. No ads, no tracking.

Gridwell is Sudoku that actually makes you better at Sudoku.

Most apps hand you the answer when you're stuck. Gridwell teaches you the technique instead — it shows you the next logical step and names the strategy behind it, so you learn to spot it yourself next time. Every puzzle is solvable by pure logic. No guessing, ever.

CLASSIC & KILLER SUDOKU • Hand-crafted Classic Sudoku across four difficulties: Easy, Medium, Hard, and Expert • Killer Sudoku with cage sums for a deeper challenge • Every puzzle is guaranteed to have one solution and to be solvable by logic alone

HINTS THAT TEACH • Stuck? Get a hint that explains the actual solving technique — naked singles, hidden singles, and beyond • Learn the "why," not just the "what" • Three free hints on every puzzle

BUILT FOR FOCUS • Clean, distraction-free board • Smart highlighting for rows, columns, boxes, matching numbers, and conflicts • Pencil marks with optional auto-clear • Undo, erase, and a gentle nudge when you slip • Beautiful themes, custom accent colors, and full light/dark support

PRIVATE BY DESIGN • 100% offline — play anywhere, no connection needed • No ads. No tracking. No accounts. No data collected. • Your progress stays on your device, always

GRIDWELL PREMIUM Unlock once, keep forever: • Unlimited teaching hints • Premium themes and custom colors One simple purchase. No subscription. No ads — not now, not ever.

Download Gridwell and start solving smarter.