It's the final mission for the final Ninja: Defeat Akura!
Use the arrow keys left and right or A and D to run left and right. Press Arrow up or W to jump. Press Arrow down or S to get invisible. Click the mouse to throw Shurikens. Click and hold the mouse to throw a rope you can swing from and climb up with. When hanging on the rope press Arrow up or W to climb up or press Arrow down or S to climb down. Press Arrow left or right or A or D to swing on the rope.