Shreya saw the 10×10 grid and immediately mapped it to constraint satisfaction. She read "no-repeat per row, column, and region" and said "that's SAT adjacency." She plays 9×9 herself. Her daughter plays 6×6. Both are competing internationally.
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9×9 — CONSTRAINT DENSITY
Parent Mode
6:44
Top 3% globally
// Constraint propagation depth
Grid 9×9: 81 cells
Regions: 9 non-overlapping
Arc consistency: O(n³)
✓ Solved in 6:44 by human
Daughter: 6×6 · 3:21 · Rank 8th globally
Shreya noticed her daughter's tablet screen and saw the grid. Nine rows. Nine columns. Nine 3×3 regions. She didn't need to read the instructions.
"This is constraint satisfaction. You're doing CSP by hand." Her daughter looked at her blankly. "It means you're doing what computers spend a lot of time on," Shreya translated. "You're better at this than most algorithms on early grids."
She tried the 9×9 herself. Got 8:47 on her first attempt. Knew immediately where she'd wasted moves — she'd applied brute-force scanning instead of constraint propagation. She tried again. 7:22.
Her daughter watched and asked: "Are you competing?" Shreya showed her the leaderboard — 14th. "I beat 7th yesterday," her daughter said. They were playing different grid sizes. Same global pool.
Now they compare rankings at dinner. Shreya explained naked pairs to her daughter this week. Her daughter explained a visual pattern she uses for corner regions that Shreya hadn't considered. Flow went in both directions.
They've started a private room on Saturday mornings. Shreya on 9×9. Her daughter on 6×6. Same start time. Timer goes. Nobody talks until someone finishes.
Child on 6×6. Parent on 9×9. Same platform. Different constraint depth. Both competitive.
16 cells. 4 rows, 4 columns, 4 quadrants. Constraint propagation with very low branching factor. Ages 5+. Average completion 2–4 minutes.
36 cells. Requires naked pair detection for efficient solving. Children typically reach this after 2–4 weeks of 4×4. Average top-10 time: sub-4 minutes.
Full constraint satisfaction complexity. Requires hidden singles, X-wings, and chain reasoning at speed. The 10×10 regularly produces sub-10 minute results in the global pool.
Each cell placement narrows the solution space of neighbours. Your child is doing forward checking on each move — the same technique used in SAT solvers, though they'd call it "eliminating options."
The live format adds time pressure. That forces chunking — recognising configurations without deliberate analysis. The same skill that makes experienced coders read code faster than beginners.
Expert sudoku players avoid guessing. They find the forced moves first. This is the same discipline as writing provably correct code the first time — systematic, not trial-and-error.
Grand Prix — Multi-Grid Session
9×9 — Parent Bracket
6×6 — Junior Bracket
Both players. Different grids. Same family rivalry.
You've thought about these things. Here's how it's built.
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Constraint satisfaction. Pattern recognition. Systematic search. This isn't just a fun puzzle. It's foundational computational thinking wrapped in a race.
Everything you need to know about Kidoku Live for this use case.
Sudoku is solved using constraint propagation — the same algorithm used in scheduling software, circuit design, and AI planning. Each cell is a variable with a domain of possible values. Placement eliminates values from related cells. This is the exact mechanism behind constraint satisfaction problems in computer science.
Yes. Kidoku Live's 9×9 and 10×10 grids provide genuine cognitive challenge for gifted children. The global Grand Prix competition means they are tested against the world's best players, not just their peers. The Hall of Fame provides a clear performance benchmark independent of school grades.
Yes. Private rooms allow parents and children to compete on the same live puzzle simultaneously. The parent can choose a harder grid size to level the playing field. This is one of the most popular use cases — technology professionals who appreciate the constraint logic playing competitively against children who are quickly catching up.
Kidoku Live is a consumer product, not a developer platform. There is no public API. The technical interest is in the game itself — the constraint logic, the leaderboard mechanics, and the Grand Prix format. Technical parents often describe it as the most intellectually honest children's game they have encountered.
Constraint elimination builds systematic logical reasoning — the ability to determine what must be true by eliminating what cannot be. This skill transfers directly to algebraic reasoning, proof-based maths, and any problem where the answer must be derived rather than recalled. Teachers report improved performance on multi-step problems in children who practise daily.
Play the grid that matches your level. Your child takes the 6×6. You take the 9×9. Whoever finishes fastest sets the benchmark.
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