Logic Masters Deutschland e.V.

This was set for Scojo's Setting Saturday prompts. isajo4002 redeemed this prompt to create a puzzle where the puzzle will have different solutions depending what ruleset was used.

Thanks to Laake for testing!

Due to the nature of the puzzle(s), I have decided to use the most difficult grid for the difficulty rating of this post, but individual difficulty estimates can be found in the rules.

SudokuPad Link - Doppelgänger

SudokuPad Link - Quattro Quadri

Rules:

In All Grids:

• Digits along an arrow sum to the digit in the bulb of the arrow.

• Digits along purple renban lines from a collection of non-repeating, consecutive digits arranged in any order.

• All dominoes in the 6x6 summing to a multiple of 5 are given. Cells separated by an X sum to 10 and cells separated by a V sum to 5.

Sudoku Grid - 1 Star Difficulty:

• Place the digits 1 to 6 in the grid such that digits do not repeat in any row, column, or box.

Doppelgänger Grid - 3 Star Difficulty:

• Fill each cell of the main grid such that every row, column and box contains a 0 and five different digits from 1-6.
• No two rows, no two columns and no two boxes may be missing the same digit.
• For each 0 in the grid, the digits missing in its row, column and region must be three different digits.
• Fill each outer cell with the digit missing from the corresponding row, column, or box.

Quattro Quadri Grid - 4 Star Difficulty:

• Place the digits 1 to 9 in the grid such that digits do not repeat in any row, column, or box.