It felt like not killing anybody was the best strategy to get the highest score. Ninjas don't seem to be as good at killing wizards as I am. :D
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Ninjas don't kill them but take up all the space leaving no room for the wizards to spawn :p .. I thinking ninjas killing the wizards would have been a better option though but it would then not look overcrowded so I didn't add it.. I hope nobody else notices that not doing anything is a good strategy :p