Loosely true "facts" about Smash bros!
Super Smash Bros|N64
The first SSB game. Has the initial roster of Fox, Pikachu, Kirby, Cpt. Falcon, DK, Mario, Link, Samus, and Bowser(Correct me if I'm wrong on this one, I'm just spouting from memory)
This game is famous for its unforgiving hitstun and lack of hit lag that made SSB combos almost impossible to get out of. SSB is famous for its "perfect" combos.
Super Smash Bros Melee|Gamecube
The second entry of SSB. Melee perfected the combat aspects and technical skills of Smash. Including the addition of many new characters, it introduced Directional Influence, Teching, L cancelling, Wave Dashing, Dash Dancing(Although this might be in 64), Smash DI, Power Shielding, and Wall Teching(also probably in 64). It also added many new modes but these weren't as comparable to next in the series. Smash is most notable for being considered the most technical and competitive game of the series due to the shorter hitstun and longer hit lag, that made combos at lot more difficult and shorter but still effective if the other party mess up their DI. Melee is played at both EVO and APEX.
Super Smash Bros Brawl|Wii
The third entry of SSB. Brawl focused more on the story mode and content aspects of Smash. Brawl removed true wave dashing and dash dancing(frame perfect) from Brawl but replaced it with even less hitstun and longer hit lag. This along with the slower speed of the game, makes combos even harder than Melee. They also added tripping. These changes make Brawl less competitive but more focused on knockouts and racking up damage with individual attacks. This also drastically increases the survival rate of Brawl characters and makes the matches much longer. Brawl also added online multiplayer, the Smash Ball(special attacks) and level creation. Brawl is played at tournaments as well, but less so than the next entry. The new roster changed many characters in order to make it more unique and rebalance the characters. While this is generally true characters like Ganondorf have been drastically nerfed. Furthermore, Medaknight is in the S tier while all the other characters are on the lower numbered tiers. This makes Medaknight banned in most tournaments.
Project M|Wii (Homebrew)
Considered to be Brawl 2.0, Project M is a Brawl mod that makes Brawl more like Melee. Many character's have been modified to make the game more balanced including Sonic, Zelda, Ganondorf, Bowser, and Mario.
They have also removed tripping, and added all of the technical skills from Melee. However, Project M is still slightly slower than Melee. Furthemore, Character such as Medaknight and Samus are not finished. Project M requires a working Brawl disc and Project M installed on the Wii. Project M can also be played on the Dolphin Emulator.
Super Smash Bros U/Wii U/3DS
The next unreleased entry of Smash. This game upscales the graphics to HD and is playable both on the Wii U and the 3DS. Most information is speculative at this point. Redesigned characters include Bowser. Wii Fit Trainer, Villager, and Megaman have been confirmed to be added.