Medium Level 11 - Circular Logic

Waves: 24
Lives: 10
Cash: $50

There's a great tip in the intro to this level - double-tap a laser to lock and unlock it. So if you place your lasers to fire along pathways and slow down the critters enough, you can fry them with just three towers :). Very economic.

Medium Level 10 - Knot so fast!

Waves: 14
Lives: 10
Cash: $20

On this Geodefense level, the only towers that could keep up with the speed of the critters were the lasers. I tried everything else. Got there in the end.

Medium Level 9 - Good Plumbing

Waves: 24
Lives: 10
Cash: $60

Not too difficult for a Medium Level. It's nice that you get the chance to shoot critters several times with the same tower. Looking forward to playing 'Swarm' when it comes out.

Medium Level 8 - Bad Plumbing

Waves: 24
Lives: 10
Cash: $50

Build up the defences, and slow them down. Fun trying to guess where they will appear from next.

Medium Level 7 - Sticky Hairball

Waves:18
Lives: 10
Cash: $50

This is kind of fun and not too difficult once you realise that you need weapons that have a longer reach and which can catch fast moving critters. So I opted for laser towers exclusively and got through once more without losing a single life....

Medium Level 6 - Sneaky Snake!

Waves: 12
Lives: 10
Cash: $50

I used a combination of all the available towers. The critters needed wearing down early in their journey, although I also needed to place some towers near the last lap to catch any sneaky ones. It took quite a few attempts before I found a winning formula.

And here is a video of a slightly different solution.

Medium Level 5 - Happy Thanksgiving!

Waves: 12
Lives: 10
Cash: $50

It was tempting to get very strategic with this Geodefense level, with carefully placed lone wolf towers gradually enhanced. Except that the critters kept gettin through. In order to survive with all lives intact, I was forced to resort to lots and lots of green Blaster Towers to wear them down. And wear them down I did.