Only One is a hack-and-slash game where you battle against hordes of enemies. You are the only one left standing in the battle to fight for survival. The battle is epic in scale, with more than 90 waves of enemies to battle, each with their own unique abilities. The game is divided into five chapters, each with its own unique storyline.

You can fight with your fists, your sword, or your magic. You can also utilize a wide variety of attacks and abilities to ensure your survival.

The game is entirely free to play, and all the content is available in the English language.