Good Game At first I was cursing the game for not having hotkeys, as it was difficult to cast meteors quickly enough to kill champion ninjas. But I just realised you can hold shift to quickly cast multiple meteors which makes a HUGE difference in getting the hard badge. Once fully skilled up you can cast 5 meteors in a row which kills a ninja outright. Please rate up this comment to keep this info visible.
Easy, simple way to beat the octopus is to raise your attack to max, raise speed and agility to max, then attack it's top two tentacles until they're destroyed, then attack the body- 2 minutes flat.