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Sudoku

Each row, column, and region must contain the digits 1-9 once each.

Folded Lines

There are some lines in the grid. Each line must be "unrolled" to be a straight line in one of the two directions from the ends of the line. Any digit on the "rolled" line must appear in the same relative position on the straight line. All lines have the same 4-cell 'X' shape. Which direction to unroll the lines must be determined by the solver. Lines cannot be unrolled in a direction that would extend out of the grid.

Ratio Kropki Dots

Cells separated by a Ratio Kropki dot must have a ratio of 1 to 2.

Difference Kropki Dots

Cells separated by a Difference Kropki dot must have a difference of 1.

Custom Fog of War

The grid is partially covered in fog. Placing correct digits will clear the fog from that cell and may clear the fog from other cells in the grid. Guessing is not required.