Eric Fox's Puzzles

       Divide the grid into square regions of orthogonally connected cells. Region borders may not form any four-way intersections. Borders with white dots separate two squares with the same size. Borders with black dots separate two squares with different sizes. Solve online

       Draw a non-intersecting loop through the centers of all cells that passes through every circle. Each circle marks the center of the straight line segment it lies on. Solve online

       Place a number from 1 to N into each cell so that each row and column contains every number from that range with no repeats, where N is the side length of the grid. All pairs of orthogonally adjacent cells containing numbers with a 1:2 ratio are marked with a black dot. All pairs of orthogonally adjacent cells containing consecutive numbers are marked with a white dot. A 1 next to a 2 may be marked with either dot. Solve online (f-puzzles.com) Solve online (puzz.link)

       Place lights in some cells so that every cell is illuminated. Lights illuminate the cell they’re in as well as all cells seen in a straight line horizontally or vertically, not obstructed by a black cell. Lights may not illuminate each other. Clues represent the number of lights in the (up to) four cells surrounding the clue. Solve online

       Shade some cells so that no two shaded cells are orthogonally adjacent and the remaining unshaded cells form one orthogonally connected area. An unshaded clue indicates the number of orthogonally adjacent shaded cells. A shaded clue indicates the number of diagonally adjacent shaded cells. Solve online