Fan game

Fan games are unofficial games based on official Smash Bros. games, usually created by fans with small or non-existent budgets.

In the Super Smash Bros. series

Many fan games based on the Super Smash Bros. series have been created. While they are unofficial, they are sometimes considered an important part of the Super Smash Bros. community. Multiple fan games have been created, each with its own fanbase. As a difference to retail products, fan games are free and require a simple internet download. Fan games often add characters many fans want in the official Smash Bros. games (such as Mega Man or Ryu), and are made with completely 2D sprites and backgrounds, compared to the 2.5D of the official Smash Bros. games. Many fan games also tend to have considerably simpler mechanics than retail games; Super Smash Flash, for instance, only gives roughly five moves to a character, while MultiHero characters have around seven. Fan games are typically played over the Internet, or by downloading a flash game from the Internet.

While there are many popular fan games, the most popular fan games include Super Smash Flash and its reboot, Super Smash Flash 2. Other fan games exist, such as Super Smash Bros. Crusade, Super Smash Bros. NES, Super Smash X, Super Nuke Bros. Melee, Smash Bros. Duel, MultiHero, and Super Smash Bros. Engine Demo, and the popular DS homebrew, "Super Smash Bros. Clash"

An example of a fan game. MultiHero has mechanics similar to Super Smash Bros., such as four player action, items and a stock mode, among other similarities.
Fan games, however, can have their own properties. MultiHero, for instance, has the concept of "Super Specials", which predated the concept of Final Smashes in Brawl.
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Super Smash Flash, by McLeodGaming, is another fan game that is based off of Melee, but adds new characters and stages.
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Mario in the reboot to Super Smash Flash, Super Smash Flash 2, a fan game based off of Brawl.