Puzzle 1 - Short Loop Draw a non-intersecting loop through the centers of all empty cells. No straight line segment may be more than two cells in length Solve on Puzz.Link
Puzzle 2 - Norikabe Shade some dominoes of cells, dividing the grid into regions. Shaded dominoes may not touch orthogonally. Clues cannot be shaded, and every orthogonally connected area of unshaded cells contains exactly one clue, the value of which represents the size of the area Solve on Penpa+ https://tinyurl.com/55yvev7u
Puzzle 3 - Yajilin (Regions) Shade some cells so that no two shaded cells are orthogonally adjacent and draw a non-intersecting loop through the centers of all the remaining cells. Numbered regions must contain the indicated amount of shaded cells
Solve on Puzz.Link https://tinyurl.com/2p99ccyt
Puzzle 4 - Vault Sudoku Each row, column and 3x3 box must contain the digits 1 through 9. Digits in a grey region cannot be placed in any cells orthogonally adjacent to the region Solve on Penpa+ https://tinyurl.com/mrywh7xf
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