Normal sudoku rules apply. Each Invader sums to 10 with a digit in some orthogonally adjacent cell. Digits connected by a 𐌔 always have the same difference. Strategically place 3 turrets into cells in the bottom row. Each turret has as many missiles as the digit in its cell, and can pivot to fire them upwards or diagonally. A turret can destroy an Invader on a digit N by shooting it N times. Each Invader is only shot by one of the turrets. All Invaders must be destroyed!