Sudoku Mathrax - 200 Easy to Normal Puzzles 7x7 (Volume 12)

Mathrax consists of a square grid.

The goal is to fill in each cell with numbers from 1 to N, where N is the size of the puzzle's side.

No number may appear twice in any row or column.

Circles with additional conditions may be situated on intersections of lines inside the grid. A number and a sign of mathematical operation (addition, subtraction, multiplication, division) - a number is a result of an operation execution with numbers in diagonally adjacent cells.

A letter "E" ("even") - all numbers in four cells are even.

A letter "O" ("odd") - all numbers in four cells are odd.