To do this, you must first create a stage with one open row in between it. For example, have four blocks going to the right, one block below the first block set, and six blocks under the two blocks about it. Once the Sandbag is back in the corner, use anyone very fast attacks (for example, Falco) and hold down [Physical Attack] (A on a Gamecube controller or 1 on a Wiimote). Sandbag will be off the ground while hitting it. Normally without a wall, it would eventually back away too far and you could not hit it. However with the wall, you can keep hitting it as long as desired. This is useful for getting the combo challenges on the Challenge Board.
