The Puzzle Robot #13 – BACA
or solve online (using our beta test of Penpa-Edit tools; use tab to shift between number entry and shading modes.)
Theme: Trapped in A box
Rules: Either shade or add a single letter (A, B, or C) to each square so that each row and column contains exactly one A, one B, one C, and the rest shaded squares. Cells in the grid already marked with a letter can be shaded or remain unchanged.
Letters outside the grid indicate the first letter seen from that direction.
Numbers outside the grid describe the size of groups of consecutive shaded squares in that row or column in order. There must be at least one unshaded square between groups.
Or, see here.
Answer String: Enter the number of the column where the B is placed in each row, starting with the top row and proceeding to the bottom.
Time Standards (highlight to view): Grandmaster = 4:30, Master = 5:45, Expert = 11:30
Nice mixture of logic 🙂
Actually I forgot the type. I made just for the OAPC. But the last month we had a book project and one of the puzzle types was BACA. While I was making puzzles for that book I remembered the fun of the type. I agree with you, it is a nice combination of Paint it Black and Easy as ABC.
Why the center A? It’s immediately blacked in the solve and not needed for the aesthetics.
It made me re-read the rules a few times because it felt weird for the A to be there with the rules as I understood them.
Otherwise nice puzzle.
I’m going to guess because the center A is “Trapped in A box”. Otherwise the theme would have to be “A box”.
Nice variant !
What’s the book?
A Japanese book. Some Japanese authors and I prepared a book, it will be sold during the WPC in Beijing. You can see the sample pages. The instructions of the book in English will be added in there.
Loved it! Thanks 🙂