What the Pro version buys you

Steampunk Defense is a fantastic game in my opinion. However it should be noted what you get in the Pro version vs the free.
The free version runs off of fuel, a requirement to play a scenario. You can obtain fuel by waiting in real time or watching a 30sec add for 10 fuel ( there is also the option to buy it with real money)
Buying the Pro version completely removes the fuel currency! The pro version also gives you the ability to gain gold or chips (other currency) by watching a 30 sec add.
WHAT PRO DOES NOT BUY YOU: heroes, buying the pro version does not automatically give you access to any of the other heroes in this game. If you want them you will have to buy them separately.
This is my only pet peeve with this game. I ask the makers to give at least one hero free with the purchase of the pro version. Just one .99 cense hero... plz consider it...
otherwise great tower defense game!

DirtDrD about Steampunk Defense Pro, v1.6