Introduction - Not much more I think could really be done to improve the speed. There might be some minor optimizations, but nothing huge. Lower Mall - Same thing here. Super solid level. Sports Store - I was a bit too careful - you could easily shave some seconds off with being a bit faster with the detonation. Supermarket - This is the first really interesting and large level of the game. Early bag lady was clean. I want to experiment with grabbing the speed power earlier in the level and using that zombie to catch all the stragglers. I will be exploring this option soon. Upper Mall - Not really sure what else could be done for this level. It's pretty straightforward. The Cinema - I think I did really solid besides the fast lady in the beginning. I had to waste a lot of time to hunt her down and it made the rest of the cinema more unreliable because I had less zombies to work with. Definite room for improvement.