6 puzzles per page. 8.5" X 11" Book. (215.9 mm X 279.4 mm). Super fitness and energy for the brain. Akari puzzles. Akari sudoku puzzles with the names: "Light Up", "Bijutsukan". Is a logical puzzle. The playing field consists of white and black cells; in some black cells are numbers. It is necessary to place the "lamps" in white cells in such a way that the entire playing field is lit, but the lanterns do not "shine" on each other. The light of the lantern spreads horizontally and vertically but can be blocked by a black cell. A black cell can contain a number from 0 to 4, indicating how many lanterns should be placed next to it (the lanterns placed diagonally from this black cell are not taken into account). If the cell does not contain a number, any number of lanterns can be placed near it. Jigsaw Killer Sudoku. This Sudoku leads step by step to the top of the skill. It is necessary to fill empty cells with numbers from 1 to 9, each of the digits should appear only once in each row and column of the 9x9 square. The puzzle contains areas in an arbitrary form. The sum of all the numbers in the cage must correspond to the number printed in the corner. They can be called figurative or geometric, they also have names (Killer Jigsaw Sudoku, Killer Geometry Sudoku, Killer Irregular Sudoku, Killer Kikagaku Nanpure). 100 Akari puzzle 17x17 hard levels. 100 Akari puzzle 18x18 very hard levels. 100 Jigsaw killer sudoku puzzles hard levels. 100 Jigsaw killer sudoku puzzles very hard levels. Unique puzzles. + 250 sudoku difficult levels that can be downloaded and printed. + 250 maze puzzles that can be downloaded and printed. Only 1 verified solution. All answers are at the end of the book. Exclusive puzzles. An excellent book for free time and mind exploration. I hope you enjoy the book. Best regards, Basford Holmes