Logic Masters Deutschland e.V.

Normal 4x4 sudoku rules apply.

Skyscrapers: All outside cells on a clue must contain a digit. That digit counts how many digits are 'seen' looking into the grid in the row/column. Digits are visible when they are larger than all digits before them.

Renbans: Digits on a pink line form a consecutive sequence without repeats when sorted.

Click on the image to play!

Normal 4x4 sudoku rules apply.

Skyscrapers: All outside cells on a clue must contain a digit. That digit counts how many digits are 'seen' looking into the grid in the row/column. Digits are visible when they are larger than all digits before them.

Region Sum Lines: Region borders separate lines into segments of equal value.

Click on the image to play!

Normal 4x4 sudoku rules apply.

Skyscrapers: All outside cells on a clue must contain a digit. That digit counts how many digits are 'seen' looking into the grid in the row/column. Digits are visible when they are larger than all digits before them.

Slow Thermometer: Digits on a slow thermometer must not decrease starting from the bulb end.

Click on the image to play!

Normal 4x4 sudoku rules apply.

Skyscrapers: All outside cells on a clue must contain a digit. That digit counts how many digits are 'seen' looking into the grid in the row/column. Digits are visible when they are larger than all digits before them.

German Whispers: Adjacent digits on the line must differ by at least 2.

Inequality: The inequality points to the smaller of the two digits.

Click on the image to play!