[quote name='4thHorseman']I always placed a mine right in front of the console. So when they go to take it from me, BOOM!
And I'm not sure how far you are level wise, but if you are just starting you might wait a little and buff your person up a bit to strengthen turrets or be able to use 2 mines at one time.[/QUOTE]
well honestly, the best time to do the challenges is pretty early on. the higher level you are, the harder its going to be. i think i did the last challenge (the tower) at like level 8 or something.
the thing with the landmine in front of the console is if there is 1 person there, its probably cuz you died. so youre most likely going to get over run anyway. the last wave is the one you really need to be on your toes with. i personally liked placing the mine in a hallway cuz when it goes off, it knocks down like 3 people and then i can mow them all down at once and then worry about the other doors where people are coming from.