Some fun online fighting games are "The Great Massacre," "Flash's County" and "Kung Fu Grandpa." As of July 2015, all of these Flash-based games remain free to play online.
In "The Great Massacre," the player controls a character named Greg, the game's immortal hero. However, Greg loses his powers, and the player must use Greg to defeat his enemies and gain his powers back.
"Flash's Bounty" challenges the player with medieval battles in a classic online role playing game.
"Kung Fu Grandpa" requires the player to help a grandpa get rid of the bad people in his neighborhood while earning money in the process.