This 1999 crossover fighting/platform main game pits iconic characters from various Nintendo franchises against each other. The core gameplay loop involves increasing an opponent's damage percentage to make them vulnerable to being knocked off the stage, rather than depleting a health bar. Matches are defined by chaotic brawls, stage hazards, and the strategic use of randomized items and power-ups. Its distinctive feature is the percentage-based knockback system, fundamentally altering traditional fighting game mechanics.
The central objective of combat involves increasing an opponent's damage percentage through successful hits. As this percentage rises, characters become increasingly susceptible to being knocked far distances. The primary win condition is successfully launching an opponent completely off the boundaries of the active stage area.
Matches are characterized by the inclusion of various items and power-ups that spawn dynamically during battle. These elements introduce an element of unpredictability, allowing players to utilize temporary boosts or offensive tools to gain an advantage over their rivals.
The defining characteristic of this title is its crossover nature, pitting beloved figures from disparate gaming worlds against one another in direct combat. Furthermore, the damage system, represented by a percentage counter, directly influences knockback distance, creating a distinct strategic layer absent in many other fighting games of the era.
The gameplay loop centers on mastering character movement, understanding stage layouts, and strategically utilizing environmental items to secure KOs.
Instead of focusing on complex combo strings aimed at reducing a life bar to zero, the emphasis shifts to positioning and momentum. Players must constantly manage their character's damage percentage while simultaneously trying to knock opponents into precarious positions near the edges of the fighting area.
As the foundational title in the series, this game does not feature any downloadable content (DLC) or official expansions released post-launch. It represents the core experience as it was originally designed and released across its supported platforms (Nintendo 64 and Wii).
The game's atmosphere is lighthearted and energetic, serving as a celebration of Nintendo's diverse character roster. While there is no deep narrative storyline presented, the setting is purely competitive, focusing on one-on-one or multi-player arena combat.

Smash Remix is a hack for Super Smash Bros. (Nintendo 64) with new content such as many new characters, stages and soundtrack.

Super Smash Bros. Sonic 2 Mod is a mod for Super Smash Bros. (N64) which changes the stages of the games to new stages based on Sonic the Hedgehog 2.

Super Smash Bros. Sonic Mod is a mod that changes Super Smash Bros. to feature Sonic the Hedgehog stages.

19XXCE (Complete Edition) is a casual version of 19XXTE (Tournament Edition) and is a Super Smash Bros. ROM hack/mod made for casual players, with more new features (like enhanced training mode) and stages not present in the vanilla Super Smash Bros.

19XXTE (19XX Tournament Edition) is a ROM hack/mod of Super Smash Bros. (Nintendo 64). It is the first notable mod for the game, with development having started in May of 2015. 19XXTE is based on 20XX Tournament Edition; that is, the purpose of the mod is to assist in running tournaments, help players learn the game, and add other cosmetic changes instead of exclusively modifying characters or stages. 19XXTE has seen tournament use, being notably used at GENESIS 3 and Super Smash Con 2016; its most important feature is the ability to add a timer to a stock match like in later games, saving tournament organizers from the trouble of keeping track of match time externally. It has a more complete version, 19XXCE (19XX Complete Edition), meant for more casual gameplay.