The Stage Builder (ステージ作り Sutēji-tsukuri, Making Stages) is a feature in Super Smash Bros. Brawl that allows players to create their own custom stages. Builders must choose to create a small, medium, or large stage, which will affect the number of parts that can be placed and the location of blast lines. Next, the builder selects a theme: a mountain, a ruin-ish building, or a futuristic chamber. Each theme has its own set of special stage elements which allow for slight variations in stage design depending on what theme is used. The final step before building is picking music, which can be any track that has been unlocked (but only one track may be used per stage), though the player will have a chance to choose a different track after the stage itself is built.
There are different structures and building materials the player can use depending on the background chosen earlier. There are three different sizes for most of the structures, as well. Unless by hacking, the player, however, is limited in the number of parts they can use per stage. Each piece used will use up a certain amount of memory for the map, and some pieces take up more memory than others. Once ready, the player can test the stage through the editor; however, the player is limited to using Mario with the default controls for the controller being used. One can also switch back to the editing screen to make more changes. Custom stages are compatible with SD cards. The limit to the number of custom stages a player can have depends on how much room one has in their internal Wii memory or SD card. The player can also send stages to their friends.
Types of parts the player can use in this mode come in three categories. Standard pieces include things like blocks, platforms, ramps and stairs. Structures are available as well, such as trees, mushrooms and rock arches. Features include Drop Blocks, springs and other things that are not simply platforms. Stages require a minimum of four horizontal areas (for spawning points) for the game to allow them to be saved.
 Starter parts
There are three categories of parts: Floors, Structures and Features. The following list gives the name (unofficial), description, variations by theme and size of each available part.
Structures 1st part
 Unlockable Parts
There are also certain parts and features that can be unlocked to use in the Stage Builder.
Due to what have been perceived to be arbitrary limitations of the Stage Builder mechanism, a multitude of hacks via USB Gecko and external applications such as Stage Studio have allowed Smashers to create more elaborate stages by removing most of these limitations; workarounds allow for overlapping blocks, unlimited blocks in a single level, and more complicated movements for some platforms.
 See also