Cell guide: Build a normal network of collectors and park a blaster at each of the places the creep spills out. Build a relay up to the ledges that separate the 'cells' into thirds, and build collectors north. Build mortars at the top, they blast the creeper from the source. Build mortars on the ledges to nuke the craters. You can easily push up to the creeper using a certain method. To get in, I use what I call the "Cover Fire" method. Put a blaster up on the ledge, then it starts making a small hole in the Creep. Build a blaster and THEN move it into that spot. It makes the whole bigger. Build a third blaster and move it to accompany the blaster that's below the ledge. By this time there should be a large enough space to make a collector. Make one, and when it's finished (for the sake of ammo packets) move the 2 blasters in front of the collector. You then repeat, but instead of a ledge, you just keep moving the blasters forward. There's your Card.
Comprehensive Bowl guide: Move Odin City onto the top ledge way to the left. Build 2 collectors, one left, one right, build a SAM, a blaster, and a mortar, one at a time. Build backwards and to the left till you hit the left wall. When the weapons are built, only activate them when necessary, but always keep the SAM on. Put the blaster on the right side of Odin City to fend off the Creeper from the right. Only turn the Mortar on when the trench is almost too full, and turn it back off when it's shallow. Branch out and get the drone and go back to Odin City. Build a drone on the ledge just below Odin City and bomb the lowest part of the bowl. Move in to the bowl and set up blasters along the way and take the bowl. Continue as you see fit. Hope it helped!