GridMewIntro puzzles
Original puzzles, ready for a little quiet thinking.
Intro boards in this collection use two or more fixed cats and finish with single-candidate placements. Practice updating all affected rows, columns, regions and neighboring cells. Labels describe the generator’s verified rule trace and remain provisional pending human calibration. Choose a board size independently.
Difficulty reflects the reasoning, not just the board size.
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Build the habit of proving a single
Intro boards begin with at least two fixed cats and have a verified route using single-candidate placements. Your task is to explain why every other cell in a chosen group is unavailable. Do not pick a cell only because its region is small.
After each new cat, review its row, column, region and immediate neighbors. Compare a short compact finish with a longer large-board cascade to practice the same rule with different amounts of scanning. These groups describe the recorded route, not measured human difficulty.
Puzzle collections by size
Learn from an original board
Explore sixty original boards with complete, diagrammed reasoning. Try a puzzle first, then use its walkthrough to check a deduction or understand a new technique. Every board passes connected-region, unique-solution and proof-replay checks.
Go to Learn · Read the validation method · Print a puzzle pack
Browse by reasoning
Choose the kind of deductions you want to practice, independently of grid size.
Original puzzle walkthroughs
Each guide has its own starting board, verified deductions and an answer you can choose to reveal.
5×5 worked puzzles
- gm-5-0002 · Let the fourth row settle the top edge
- gm-5-0004 · A short finish between three fixed cats
- gm-5-0006 · Check the unused columns against the remaining rows
- gm-5-0009 · Use a middle-row single to separate the ends
- gm-5-0010 · Resolve the outside rows before the top centre
- gm-5-0011 · One right-edge cat completes two distant constraints
- gm-5-0013 · Three givens leave two independent row checks
6×6 worked puzzles
- gm-6-0004 · Use the three completed upper rows as constraints
- gm-6-0005 · A bottom-right cat clears a path through row 3
- gm-6-0006 · Resolve the two outside rows around three givens
- gm-6-0008 · The small top region reshapes the centre
- gm-6-0010 · A regional single creates a column-5 follow-up
- gm-6-0011 · A bottom-row single leaves a one-cell region
- gm-6-0013 · Clear the upper-left before revisiting row 4
8×8 worked puzzles
- gm-8-0003 · A singleton turns a large board into a sequence of singles
- gm-8-0004 · An upper-left region leads to a distant column single
- gm-8-0006 · Read the lower singles before returning to the top
- gm-8-0007 · A one-cell region sends information across the board
- gm-8-0010 · Two small top regions simplify a crowded grid
- gm-8-0011 · A column-first route reaches the lower-right regions
- gm-8-0013 · A narrow middle region sets the upper rows free