A crossword grid of equations — fill in the numbers so every row and column adds up.
How to Play
Every full row and column (skipping the black squares) reads as one equation, worked left to right: number, operator, number, operator, ... equals sign, result. Grids aren't always square — harder difficulties bring bigger and more rectangular boards. Grey squares are given — fill in the white squares so every equation checks out, and there's only one way to do it.
Controls
Click a square and type a number. Use the arrow keys to jump between squares. The +, −, ×, ÷ and = signs are fixed clues.