Logic Masters Deutschland e.V.

Based on the band Coheed and Cambria. Most clues represent either their logo or numbers associated with the band such as 2113, 33, and 184.

Irregular Sudoku: The digits 1-8 must appear once each in every row, box, and column.

Kropki: Digits separated by a white dot must be consecutive. Digits separated by a black dot must be in a 1:2 ratio. Not all dots are given.

Quadruples: Digits in circular clues at cell intersections must appear in the surrounding 4 cells.

Arrows: Digits along an arrow must sum to that arrow's circled digit.

Little Killer: Digits along an indicated diagonal must sum to the given total.

Between Lines: Digits on lines connecting circles must lie between the circled digits numerically.

Link:

CTC App