Chapter 48: Mathrax
You have a square grid in which each row and column must contain each digit exactly once. Some intersections between 2x2 groups contain clues, and your aim is to fill the grid so that all of them are satisfied.
The clues can mean:
E: all four surrounding digits are even.O: all four surrounding digits are odd.=: each diagonal pair contains equal digits.- A number with an operation: applying that operation to both diagonal pairs gives the shown result.
Mathrax is documented here from x-sheep/puzzles-unreleased. The original inventor is unknown.
More information: janko.at/Raetsel/Mathrax
48.1 Mathrax controls
Mathrax uses the same basic controls as Solo.
Left-click a cell and type a number to enter it. Press Backspace or Space to clear the cell.
Right-click a cell and type a number to add a pencil mark.
Use the arrow keys to move the selection. Press Enter to switch between normal entry and pencil-mark entry.
Press M to fill every empty cell with all possible pencil marks.
48.2 Mathrax parameters
These parameters are available from the Custom... option on the Type menu.
Size (s*s): Grid size.
Difficulty: Higher levels require more complex reasoning.
Addition clues: Allow addition-based clues.
Subtraction clues: Allow subtraction-based clues.
Multiplication clues: Allow multiplication-based clues.
Division clues: Allow division-based clues.
Equality clues: Allow equality clues.
Even/odd clues: Allow parity clues.
Status: fully implemented and playable in the unreleased collection.