Logic Games For Boys: Stostone Logic Puzzles with Answers

Stostone ("Stone on Stone") is a logic puzzle invented by Nikoli. A rectangular or square grid is divided into regions. The goal is to blacken some cells of a grid ("stones") according to the following rules:- All black cells in a region must be connected horizontally or vertically. - A cell with a number indicates how many cells in the region must be blackened. - In regions without a number any amount of cells may be blackened (at least one). - When two cells are orthogonally adjacent across a region boundary, at least one cell must be white. - If all stones "fall down", they must cover exactly the bottom half of the grid.

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