help : barier to / gold / grinder ............. so hard just one type tower any solution ??

[gateskiper]

any sugestion ?

[datacz]

From here I gathered some good tricks...
http://forums.steampowered.com/forum....php?t=1367193

[thehermit2]

Since grinder levels are progressively larger and stronger groups of walkers with no heavily-armored or faster ones, it's best to focus on area attack towers like infernos, meteors, temporals, and concussion towers. Make the path to the cores as long as possible, and try to force the aliens to backtrack down the entire length of the path to escape so your towers are twice as effective. You may have some trouble getting started; if so, build cheaper gun towers and swap them out with area attack towers when you have the resources. Good luck.

[Titan]

Using the combination of Concussion Tower and Temporal Tower is easy to handle them.

[Cumberdale]

I tend to favour inferno and temporal combinations, with litterings of meteor towers.

Tesla towers work quite nicely too, though they aren't as efficient as inferno towers. Placing one at the start of a grinder level heavily damages and kills some of the enemies in the early waves thoughs, more so than an early inferno.