You get the full roster and modes, often updated to the latest beta versions. A Roster Beyond Nintendo
While Nintendo has a history of issuing takedowns for fan projects (such as AM2R or Pokemon Uranium ), they have historically left the Super Smash Flash series largely alone, likely because it is free and does not use stolen source code. However, playing on "unblocked" proxy sites does deprive the original developers of web traffic and ad revenue on their official site. super smash flash unblocked 66 full