Haunted Boxes

(Eingestellt am 18. November 2025, 12:32 Uhr von Lizzy01)

This puzzle was meant to be for Halloween. But then the ghosts decided they didn't want to haunt the sudoku grid in the way I wanted them to. And i'm pretty sure they started messing with the digits in the calendar instead...

Rules:

Normal sudoku rules apply.

There are nine ghost cells and nine haunted cells in the grid, one of each in every row, column and box. Every digit from 1-9 appears exactly once in a ghost cell and exactly once in a haunted cell.

The value of a ghost cell is always lower than its digit. The value can be zero, but never below zero.

The value of a haunted cell is its digit plus or minus the same amount as by which the value of the ghost cell in the same box is below its digit.
The value of a haunted cell might be below zero or above ten.

All values of cells could be expressed as X/2, where X is an integer.

The values in cages sum up to the small number in the top-left corner of the cage. Digits do not repeat within a cage, but values might.

Along thermometers values must strictly increase from the bulb end.

Values along arrows sum up to the value in the circle.

Clarifications:

Example 1: if a ghost cell contains a 3, but has a value of 2, and the haunted cell in that same box contains a 6, then that haunted 6 has a value of either 5 or 7.
Example 2: if a ghost cell contains a 3, but has a value of 0, and the haunted cell in that same box contains a 5, then that haunted 5 has a value of either 2 or 8.

Cells which are neither a ghost cell nor a haunted cell have a value equal to their digit.

Ghost cells and haunted cells can have integer value or can be a value 0.5, 2.5, 8.5 etc. but NOT other fractions or decimals. Only halves. Zero is considered an integer. Haunted cells can be negative, ghost cells cannot.

Play here.