Logic Masters Deutschland e.V.

Here, have some fun with this little snack ! Consider this an appetizer for a bigger puzzle that I am currently making. I figured I'd publish this one before because it uses the ruleset with some original deductions that will probably not be part of the bigger one. This puzzle is part of a little serie I started, combining deconstruction with various shading puzzle genres (cave, nurikabe). Happy Easter, happy solving !

The puzzle :

Play on Penpa (answer check on digits, not on shading because the ruleset makes no difference between shaded and unshaded cells)

Play on Sudokupad (no answer check)

Rules :

- Normal sudoku deconstruction apply : Fill the grid with four non-overlapping 2x2 square regions, such that each region contains the digits 1-4 once each and no digit repeats in any row or column. Cells outside regions do not contain digits.

- Yin yang : the whole 5x5 grid must form a valid yin yang grid, that is shade some cells such that all shaded cells are orthogonally connected, all unshaded cells are orthogonally connected, and no 2x2 area is fully shaded or fully unshaded.

- Killer cages : Digits in a cage must not repeat. The number in the top left corner indicates either the sum of the digits of the shaded cells or the sum of the digits of the unshaded cells contained within that cage (or both).