If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Help the ninja Naruto to jump into the air. Use your credits in the shop to change Naruto and develop his powers. Use rasengan or Kyubi mode to jump even higher. Destroy clones Sasuke and avoid its powerful attacks.
Use the arrow keys and the mouse. Press B to return to the title screen. Pause or mute with P or M.