Infinite Zombies

You can complete infinite zombies once a week and use the auto feature to “redo” your best performance and give you the TD coin of your best try. You want to browse the armament store everyday for deals and buy the best boosts you can and then after the weekly reset on Friday, use your boosts and get the highest score you can. Then you can Auto the rest of the week! 

Try to boost the middle lasers before the edges as they spend the most time on targets. Also try to boost the top side first, it will help your bottom side. Some people don’t use the edge squares, I think it's better to put a tower but maybe not upgrade it too far. If I only get rocket damage boosts then I’ll put another rocket. 

Pick resources over resource %. Pick reward quality before reward amount +1. 

A-Bomb > Climate Controller > Lasers >Rockets > Slow Tower > Area Freeze > Energize > Area Bomb

I’ve been playing with different tower placements so there are a few variations

I also like where you do slow towers on each middle tile on the left and right (top left, top right, bottom left, bottom right) and then you choose the bottom tile of the bottom middle 6 grouping as a slow to catch them walking into the base. This covers most of the area and then you can just put lasers everywhere else.

This specific layout will yield scores of 20000 without much effort.