free defense grid maps
 

For those who haven't noticed, you get prize tickets for the summer sale achievements and for every 3 tickets you can get a prize. Most prizes are not that interesting imo but some are ok. The one I think is best is the free DLC maps for defense grid. You need 3 tickets and those are real easy to get when you join the summer sale steam group, spam a friend profile and recommend a game you're basically there.

Free TF2 sunglasses!

Gear is one thing when it adds some functionality but sunglasses that are there just for the looks.... I think I rather take Alien Breed 2 game over that even though I don't care much about shooters as well.

You can't properly play demopan without glasses.

I spammed grahamium and took the maps!

Spammed PP and tried to take the maps, but there was some error on Steam... I guess I'll have to try again later...

Took the maps but haven't tried yet.
Thanks for the hint.

For some strange reason I can't use them tickets for any prize. I get the same damn error message everytime... :(

Steam servers are a bit under stress now.

@PP: What map(s) did you do the "out of bullets" challenges on?