The King of Fighters (ザ·キング·オブ·ファイターズ, KOF for short) is a classic VS fighting game series first released by SNK from Japan for MVS arcade system board in 1994. KOF was originally launched as a fighting contest organized for the characters from SNK's another two works - Fatal Fury series and Art of Fighting. It has a very high popularity in Asian countries.
Rocket Viper is a both Beat 'Em Up and fighting styles homebrew series game, mainly based on KoF (The King of Fighters), Street Fighter and A Tale Of Vengeance (another famous mod game with OpenBOR). Developed using OpenBOR, made by fan player Volcanic from China. Similar to Beats of Rage, but more superb and interesting.