dotio: Pips Domino Puzzles

Dominoes meet logic puzzles. No guessing, just pure deduction. dotio is a thoughtful puzzle game where every solution is earned through careful reasoning. SIMPLE TO LEARN Place dominoes on the grid so every rule is satisfied. Match sums, find equals, and spot differences. The rules guide you towards the one valid solution. CHALLENGING TO MASTER Start with a handful of dominoes and simple rules, then progress to devious puzzles with layered constraints and deeper logic. Every puzzle is designed to feel fair, logical, and genuinely rewarding to solve. FEATURES • Nearly 3000 carefully crafted puzzles, each with exactly one solution • Daily challenges in Easy, Medium, and Hard • Ultra Mode — unlock the hardest puzzles by mastering Hard • Ghost Mode — race against time as rules fade away • Pip Counter and Sum Helper tools for tricky puzzles • Smart hints that guide without spoiling the answer • 45+ achievements to unlock — badges, milestones, and more • Track your stats, streaks, and personal bests • A gentle, interactive tutorial that teaches as you play • Rotate and reposition dominoes freely • Accessibility options: adjustable text and tap or drag controls • Dark mode for late-night solving • Works offline — play anywhere • No ads. No interruptions. Just puzzles. A DAILY RITUAL Whether you play one puzzle a day or settle in for a longer session, dotio is designed to be enjoyed at your own pace. One puzzle. One solution. Pure, satisfying logic.