Logic Masters Deutschland e.V.

This is the smallest version of a set of three puzzles with the same ruleset including chaos construction, doppelganger, and a twist on normal thermometers. I recommending solving them in order from smallest to largest, as the difficulty ramps up quickly and the larger puzzles include logic used in the smaller puzzles. I'd like to thank Wullemuus and Kafkapharnaum for their help testing this ruleset!



Links including tracking cells:

4x4 puzzle	LMD Link	CTC Link
6x6 puzzle	LMD Link	CTC Link
9x9 puzzle	LMD Link	CTC Link

Rules:

1. Chaos Construction: Divide the main grid into four nonoverlapping regions such that each region is a set of four orthogonally-connected cells.
2. Doppelganger: Place the digits 0-4 into the square grid such that digits do not repeat in each row, column, and region. Digit 0 appears in every row, column, and region, but each other digit is missing in exactly one row, one column, and one region. For each 0, the digit missing in that 0's row, column, and region must be three different numbers.
3. T-lines: Grey lines are called T-lines and have the following properties:
   1) Digits strictly increase along the line from one end to the other, with the direction of increase to be determined by the solver. 2) No region can contribute only one cell to a T-line. 3) Cells from the same region cannot all be adjacent on a T-line. For example, if a region contributes digits 1 and 4 to a line, then there is a different region contributing digit 0 and some digit between 1 and 4 to the line.
4. Grey circles: There is an independent, invisible, 4-cell T-line through the four cells surrounding each grey circle.

You can also check out my other puzzles here! Happy solving and please leave a comment if you enjoy the puzzle!