For the Defense Grid ticket.
Out of Fuel:
http://i56.tinypic.com/2hi3xjb.jpg
Start with this
Then add a laser on the top left
2 lasers at the right
3 meteors behind the tesla/temporal
Upgrade, begin with Tesla and Temporal
Barriers Entry
http://i53.tinypic.com/2eoi6fm.jpg
That first lane will kill almost everything. Add more towers (Tesla/some Laser) on the right side of the map. If aliens can get to the cores, block passage so that they will have go down the ramp
Veil of Ice
http://i55.tinypic.com/2mezakg.jpg
Tricky one to show, does if you start with this you'll be good. Upgrade those towers and add some more. If aliens are getting near the cores, try to block the direct passage and sent them towards those towers you built in the first wave. Dont forget to put two missiles towers near the cores, upgrade at least one
Guardians Fall (last map)
Basically: put teslas in areas adjacent to the path and lasers in the toher areas, and some meteors when you dont have line of sight
http://i53.tinypic.com/a2tzyu.jpg
http://i56.tinypic.com/33bmwq1.jpg
http://i52.tinypic.com/imo2o9.jpg
http://i52.tinypic.com/35kvifn.jpg
I forgot the square near the cores: I used
Tesla - Temporal
Tesla - Tesla