There's 5 missions in total, and they each have 3 stages + a separate one just for the boss fight (except mission 1 where there's only 2 stages + boss). You only get 2 minutes to complete a stage, so have to keep moving. I don't even bother going after all the enemies, just the ones that are in my way. In mission 3 there's two ninjas to be careful around. One of them is invisible and materializes out of thin air, and you have to basically memorize where they appear, but they're easy to defeat. The other other is clothed in red and always has his sword out. If you come into contact with him, you die. With other enemies, if you bump into them you just fall down but can keep going, unless you get stuck in a bad spot. So yeah the game got a little harder, and I only managed to reach the beginning of stage 3-3. Also I had yard work and other boring stuff to do, so I didn't play that much.