Shikaku — Divide by Box
A spatial logic puzzle where every number tells you exactly how big it's box should be. Fill the grid completely, master rectangular and freeform polyomino rooms, and enjoy 2,000 handcrafted challenges.
How to Play
Every puzzle starts the same way: a grid dotted with numbers. Draw a shape around each number so it's area matches that number exactly — no more, no less. Do that for every clue, cover every single cell, and the puzzle is solved.
- 01 One shape, one number: never two clues, never zero.
- 02 Exact area equality: total cells must match the number precisely.
- 03 100% tessellation: shapes cannot overlap or leave any gaps.
How to Play
Every puzzle starts the same way: a grid dotted with numbers. Draw a shape around each number so it's area matches that number exactly — no more, no less. Do that for every clue, cover every single cell, and the puzzle is solved.
- 01 One shape, one number: never two clues, never zero.
- 02 Exact area equality: total cells must match the number precisely.
- 03 100% tessellation: shapes cannot overlap or leave any gaps.
Two Ways to Play
Same core spatial rule, two distinct geometric mindsets.
Classic Mode
Clean rectangles drawn corner-to-corner. The timeless Japanese spatial logic puzzle engineered with magnetic hysteresis snap hold and 1,000 handcrafted progression levels.
Weird Mode
Same exact rule, zero straight-edge constraints. Shapes bend, branch, and tessellate into freeform polyominoes (L-shapes, T-shapes, Crosses, Serpents). Features 1,000 dedicated polyomino campaign puzzles.
Three Play Styles
Structured progression or endless procedural puzzles.
Campaign Progression
2,000 handcrafted levels (1,000 Classic + 1,000 Weird) spanning 26 dimensions, from starter 5×5 grids to 30×30 master challenges.
Random Play
Four curated difficulty tiers — Easy, Medium, Hard, and Expert — procedural CSP generation delivering a unique, verified solvable puzzle every time.
Custom Grid Sandbox
Choose any width and height from 5×5 up to 30×30 to create your own customized spatial challenge.
Mastery & 3-Star Challenge
Every level systematically tracks three mastery conditions.
Star 1: Level Clear
Partition the whole board completely with zero empty cells and zero overlaps.
Star 2: Speed Master
Complete the puzzle inside the targeted par time established for that specific grid dimension.
Star 3: Flawless Finish
Solve within par moves with 0 hints, 0 undos/redos, and 0 erases. Real-time feedback tags clearly inform you if a tool was used.
Earn a prestigious Milestone Crown every 50 solved campaign levels in either mode — celebrating steady mastery, not just a lucky solve.
Crafted Visual Themes
Tailor your puzzle experience with three carefully balanced palettes.
Light Zen
Natural warm paper, soothing green sage, and high daylight contrast with zero eye fatigue.
Dark Zen
Deep slate background with organic sage accents for late-night relaxing focus.
Dark Neon
Electric cyber navy with luminous high-contrast cyan and amber glows.
Weird Cyberpunk
Dynamic palette shift on Weird Mode unlocking vibrant polyomino fills.
Procedural Sound Synthesis
100% real-time PCM sound engine (zero audio sample files) with dynamic pitch transposition and celebratory chord fanfares.
Tactile Precision & Culling
GPU MSDF vector numbers, frustum culling, kinetic inertia scrolling, and CanvasLayer block inspection cards.
19 Supported Languages
Comprehensive localization with dynamic native system font fallbacks (Arabic RTL, CJK, Devanagari, Cyrillic, Thai).
Fair to Players
The first five campaign levels are completely ad-free so you can get into the flow undisturbed. Ads are paced thoughtfully with generous cooldowns rather than interrupting every solve — and a one-time in-app purchase removes all ads permanently. Works 100% offline with zero account needed.