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Original puzzles, ready for a little quiet thinking.
Difficulty reflects the reasoning, not just the board size.
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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-5-0001 · Two possible cats, one shared exclusion
- gm-5-0002 · Let the fourth row settle the top edge
- gm-5-0003 · Keep several possibilities alive while locks accumulate
- gm-5-0004 · A short finish between three fixed cats
- gm-5-0005 · Use column locks before placing the first cat
- gm-5-0006 · Check the unused columns against the remaining rows
- gm-5-0007 · A one-cell region starts a column cascade
- gm-5-0008 · The bottom-left pair is not an equal choice
- 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-5-0012 · A column reservation unlocks a small top region
- gm-5-0013 · Three givens leave two independent row checks
- gm-5-0014 · A forced corner is only the beginning
- gm-5-0016 · Read the bottom-left region through the fixed column
- gm-5-0019 · Reserve the middle of column 4 indirectly
- gm-5-0029 · Clear the bottom row, then work upward
- gm-5-0032 · A wide lower region forces a narrow route upward
- gm-5-0034 · A singleton starts the board, a row scan carries it
- gm-5-0045 · Follow a forced cat up the left column
6×6 worked puzzles
- gm-6-0001 · A bottom-row single reaches a right-edge region
- gm-6-0002 · Two row reservations prepare a column single
- gm-6-0003 · Two singleton regions set up a vertical lock
- 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-6-0007 · A shared neighborhood settles the right edge
- gm-6-0008 · The small top region reshapes the centre
- gm-6-0009 · A bottom-left singleton opens a distant column
- 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-6-0012 · A row lock can force a cat in the same row
- gm-6-0013 · Clear the upper-left before revisiting row 4
- gm-6-0015 · Reserve the top region before choosing its cat
- gm-6-0019 · A split column still makes a valid region lock
- gm-6-0027 · Two small upper regions steer the lower rows
- gm-6-0028 · Two distant singleton regions supply the first anchors
- gm-6-0043 · A narrow central region links two edges
- gm-6-0046 · Use a top singleton to read the middle columns
- gm-6-0057 · The central singleton releases a lower-right region
8×8 worked puzzles
- gm-8-0001 · Combine a reserved row with its shared neighbors
- gm-8-0002 · Let a lower row reserve the right-hand region
- 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-8-0005 · A full column reservation starts four linked locks
- 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-8-0008 · Use two row locks at different stages of the solve
- gm-8-0009 · Successive column reservations cross the upper half
- gm-8-0010 · Two small top regions simplify a crowded grid
- gm-8-0011 · A column-first route reaches the lower-right regions
- gm-8-0012 · Separate a regional reservation from a neighbor exclusion
- gm-8-0013 · A narrow middle region sets the upper rows free
- gm-8-0030 · Two singleton regions steer a seven-placement finish
- gm-8-0052 · A forced left edge makes the central column readable
- gm-8-0053 · Walk the narrow right-side regions before scanning rows
- gm-8-0054 · A corner singleton starts an upper-to-lower staircase
- gm-8-0055 · Two singletons release the bottom-right region
- gm-8-0056 · A bottom singleton sends the solve back upward
- gm-8-0057 · A central singleton prepares an upper-left anchor