You are Kazune (the boy in the light blue robe) and you have to fight Kirio (the guy in the black robe). This is not multiplayer. Sometimes, a chance will come and Nyake will pop up. Then, Kazune can execute his special attack, Sagitta Saurus, which is very powerful. Arrow keys to move. Press space to jump. Press a to make flashes of red come out so that you can do damage to Kirio. Press p to protect yourself. Watch out for Kirio's attack, which is a red laser (maybe 3). You win when you have gotten Kirio's health to 0. Sometimes there is a glitch where when you start the game you immediately win. If that happens, reload.