No KO
Box is the common term given to a Stage Builder stage which is completely enclosed. It is impossible to get knocked out of a box. There are two main ways to build a box. The first is to simply build a stage-builder stage and make the walls and bottoms of the stage sealed by blocks. Then seal the "top" of the box with falling blocks. The fighters start and spawn at the top of the stage, it is possible to get KO'd there. The other method is to have the top, left and right sides sealed by blocks and the bottom as drop through ledges, allowing you to enter from the bottom and not be able to leave accidentally. In order to make this easier, another strip underneath can be used to land on before jumping in. Since Boxes prevent most usual KOs, they are often used for Stamina matches. Boxes can be modified for all sorts of matchups, including varied heights to negate projectiles or making it small to prevent camping. Other things such as placing conveyor belts and moving platforms can be added, making aerial matches more dominant. This is only limited by the limitations of the Stage Builder. It is also possible to build a box without having to use falling blocks with the Stage Studio. This is done by setting spawn points within the walls, floor and ceiling.
Partial Box
When a Stage Builder stage has some properties of a box, but is not fully enclosed, it creates an odd gameplay. KO's are not impossible, but rare. For example, a partial box may have a similar design of a full box, but has a small opening. Also, it may have the top layer open, but the stage is extra large, so the players cannot jump out. This removal of the side and floor blast lines causes characters with meteor smashes to have a disadvantage, and characters who have upward knockback attacks are at an advantage.
Exceptions
Some Final Smashes can cause a player to go to the top of the screen, such as Olimar's. In this case, it is possible to 'escape' the box. The escaped fighter can then get SDed.
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