Pure Logic Grid Puzzles Without Guesswork
Master deductive reasoning with Coilu's number-filled cages across four difficulty tiers and multiple grid sizes
Download Coilu
Master deductive reasoning with Coilu's number-filled cages across four difficulty tiers and multiple grid sizes
Download CoiluAll promotional offers subject to terms and conditions. Wagering requirements and game restrictions apply. Players must be 18+ or legal age in their jurisdiction.
Coilu builds on KenKen and Sudoku principles by combining arithmetic constraints with positional logic. Each puzzle grid contains cages marked with target numbers and mathematical operations. Your objective: fill cells so that every row and column contains each digit exactly once, while ensuring cage arithmetic matches the targets shown.
The engine generates puzzles on-device with guaranteed unique solutions. No randomness enters the solving process. Every cell placement follows from logical deduction based on existing constraints. Live conflict highlighting flags violations immediately, while pencil marks let you track candidate possibilities as you narrow down options through elimination.
Grid dimensions scale from 3x3 beginner layouts to 6x6 expert challenges. Difficulty tiers adjust cage complexity and starting clue distribution. The integrated Learn section breaks down core techniques: cage arithmetic deduction, row-column intersection analysis, and candidate elimination strategies that apply across all puzzle sizes.
Progress through Easy, Medium, Hard, and Expert difficulty tiers. Each level adjusts cage complexity and starting clue density while maintaining solvability through pure logic.
Choose puzzle sizes from compact 3x3 grids perfect for quick sessions to expansive 6x6 layouts requiring extended focus and multi-step deduction chains.
Generate unlimited fresh puzzles locally without server dependency. Every puzzle created comes with a mathematically verified unique solution path.
Mark potential values in cells using pencil marks. Track possibilities as you eliminate options through constraint analysis and logical deduction steps.
Reverse any number of moves to explore alternative solving paths. Experiment with different deduction strategies without penalty or progress loss.
Instantly highlight rule violations as they occur. Conflicting entries in rows, columns, or cage arithmetic targets receive immediate visual feedback.
Study proven solving techniques through the built-in Learn section. Master fundamental methods like cage sum analysis and advanced intersection deduction patterns.
Export any puzzle as a seed code for exact recreation. Share challenging grids with others or save specific puzzles to revisit at different difficulty approaches.
Record your fastest completion times across different grid sizes and difficulty combinations. Monitor improvement trends as deduction skills develop.
Unlock trophies displayed on the Trophy Wall by completing specific challenges. Track milestones like difficulty tier mastery and speed-solving records.
All features operate without internet connectivity. Generate puzzles, track statistics, and access learning materials entirely on-device during flights or commutes.
Coilu represents focused design philosophy prioritizing clean logic over monetization tactics. The absence of accounts, subscriptions, and advertising keeps attention on puzzle-solving mechanics. On-device generation and offline functionality ensure privacy and uninterrupted gameplay regardless of connectivity status.
iOS version 1.0.3 available now with complete offline capability and no ads
Download CoiluRequires iOS compatible device. App runs entirely offline. No subscriptions or in-app purchases. Suitable for all ages.