### Cave (Product) by Thomas Snyder

PDF

or solve online (using our beta test of Penpa-Edit tools; use tab to shift between shading mode and the linex mode where left click+drag draws lines and right click marks X’s)

Theme: Powers of Two

Author/Opus: This is the 411th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Variation of Cave rules. Each clue represents the product of the number of row cells visible (including the cell itself) with the number of column cells visible (including the cell itself).

Difficulty: 3 stars

Time Standards (highlight to view): Grandmaster = 4:00, Master = 5:45, Expert = 11:30

Solution: PDF and solving video.

Note: Follow this link for classic Caves and this link for Cave variations. If you are new to this puzzle type, here are our easiest Cave Puzzles to get started on. More Cave puzzles can be found in Roger Barkan’s Colossal Cave Collection, in The Art of Puzzles, and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.

• emin says:

İ Sony understand how solve

• emin says:

ı dont understand for how solve

• marred says:

I made 3 attempts, every time finished with another contradiction. Maybe I need to sleep and try again tomorrow

• David Altizio says:

Tricky one! Harder than 3 stars, I think.

• D says:

quite tricky at the start, but it is not difficult after the break-in.

• nkm says:

I made a forcing guess near the beginning and the whole puzzle fell into place very quickly. Had to go back over it knowing the right answer to find a logical path. Tricky one!

• marred says:

Fourth attempt after the night was finally successful, now I noticed things that I hadn’t seen before

• emin says:

Can you explain the logic of solvers?

• mender says:

Great puzzle, very clever!

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