Ken-Go (known as Lightning Swords in Europe) is an arcade 2D side-scrolling beat 'em up game set in a time when Ninjas and Samurai were active. The player controls a samurai armed with a sharp katana. The objective is to progress to the right through various locations in traditional Japan, defeating all enemies that appear along the way. Holding down the attack button unleashes a special blow. At the end of each level, a boss awaits, typically large, strong, and durable.