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Inertia <p> Slide the ball around the grid picking up the gems. Every time the ball moves, it will keep sliding until it either hits a wall, or stops on a stop square (the broken circles). Try to collect every gem without running into any of the mines. <p> Use the numeric keypad to slide the ball horizontally, vertically or diagonally. Alternatively, click on the grid to make the ball move towards where you clicked. <p> If you hit a mine and explode, you can select Undo from the Game menu and continue playing; the game will track how many times you died.