Mario Kart S is a Mario Kart fangame on Scratch. The S in the title stands for 'Scratch'. Player 1 uses the up key to accelerate, left and right keys to steer, the down key to reverse and M to use an item. Player 2 uses W to accelerate, A and D to steer, S to reverse and Q to use an item. UPDATE! You can change the Engine Speed in the Settings Menu.