Logic Brain Teasers: Doppelblock Puzzles - Large Print For Fun Travel

("Double Block") consists of a square grid. The goal is to blacken two cells in each row and each column. The remaining white cells must be filled with the digits from 1 to N-2, where N is the size of the puzzle's side. Each digit appears once in every row and column. Numbers outside the grid show the sums of the digits between two black cells in corresponding row or column. brain teasers for adults - brain teaser puzzles - brain teaser puzzles for adults - brain teaser games - brain teaser books for adults - brain teaser adult - brain teaser for adults - brain teaser games for adults - brain teaser gifts - brain teaser high school - logic puzzles for adults - logic puzzle books for adults - logic puzzle books - logic puzzle adult - logic puzzle books for adults variety - logic puzzle for adults - logic puzzle game - logic puzzle grid