The method of doing this maneuver correctly is to place a bomb on the ground, then the moment it detonates, place another, and continue doing this until Samus reaches the place she is trying to get to. There are other variants of this technique, such as diagonal and horizontal bomb jumping, the former being possible in the 2-D games. In Metroid, Metroid II: Return of Samus, and Super Metroid, one laid Bomb will propel Samus upward even if she is not in Morph Ball form. This feature is not present in any of the later games.