Also known as Two Not Touch.
Place two stars in every row, in every column, and in
every region, but make sure that the stars do not touch,
also not diagonally! Can you solve them all?
Draw bridges between islands so that all islands are
connected as one group. Make sure that the island values
correspond to the number of connected bridges!
Place a tent next to every tree in the field, but make
sure that the tents do not touch! The numbers around the
field tell you how much tents should be placed in a row
The classic sudoku puzzle. Fill in the missing numbers
in such a way that the numbers 1 to 9 occur exactly once
in every row, column, and block. Can you solve them all?