looks easy to make, but you'd be surprised use turbo mode
First joint is easy, just rotates an off-centred sprite. Second joint is harder, set x to sin(joint1 angle) and y to cos(joint1 angle) both multiplied by the length of the joint. The you have to alter the direction of both sprites: Joint 2 always points to mouse pointer. Joint 1 is more tricky, you add a third sprite that gives you the direction from the centre to the mouse pointer, which you then use in this formula: Joint1 = acos(distance to pointer/total joints length) + mouse direction It's like an isosceles triangle (bottom left)
