Super Smash Bros. Brawl is the third installment in the Super Smash Bros. series. This edition introduces super attacks referred to as final smashes: activated by destroying smash balls, these feature powerful and often unstoppable attacks, regularly introducing a major transformation of the character. This edition also introduces a brand new adventure mode in The Subspace Emissary which is a side-scrolling adventure in the style of a platformer. It retains all basic mechanics of the Super Smash Bros. series, such as a damage meter, stocks, and Smash-style attacks.
Super Smash Bros. Brawl has multiple speedrun variants each using different skill sets, whether you prefer the platforming action of Subspace Emissary, or the challenging optimizations of All-Star, Brawl has got it all.
Mechanics - Brawl's core mechanics can affect speedruns in different ways. Damage and knockback for example, where 1% or DI (directional influence) could be all the difference from defeating an enemy or not. These mechanics are not static across the entirety of Brawl, so it is recommended for whichever category you prefer to pick up to learn the mechanics of the run. You will see drastic improvement!
Exploit - Brawl accidentally introduced a large variety of glitches and exploits that are used within speedruns. Most exploits you will see are performed within the Subspace Emissary category such as skipping locked fights by gliding or maneuvering over their trigger, but there are also general exploits used in other categories, such as Charizard's Rock Smash damage for Boss Battles. These exploits are fun to utilize, they're what makes Brawl speedrunning the most unique speedgame in the series!
RNG - It's common knowledge that RNG is a main factor in Brawl's gameplay. However, Brawl's RNG is more manageable than you think. Take Subspace Emissary for example and how consistent it can be even with its long runtime and multitude of CPU A.I. where certain patterns are more prioritized than others. Shorter categories obviously are more affected due to a smaller window for optimizations, but if RNG is deterring you from running this speedgame, please reconsider!