dacke, when you move your mouse to the tower you want to buy, just below the list of towers is a description in big letters, showing the cost, firing speed and what it does.
http://www.kongregate.com/forums/3/topics/1328 for the walk-through (note that although the first post talks about stats and stuff, towards the bottom of the page has the story walk-thru.
http://www.kongregate.com/forums/3/topics/2784 is for the very short non-Highway Patrol story if you chose that route
Since I am leaving this game forever now that I have the card:
1. CHANGE RESOLUTION TO 800X600!! if you have problems with this game. Just right-click on your desktop and screen resolution is somewhere under settings or control panel.
2. People at very top of screen can't be whacked, only ran over.
3. Horse is too slow, field is too large.
4. We should earn at least 1 point or 1 health from running over people.
The badge works, just make sure you choose the right mode (ultimate survival-the guy with the pistol) and don't change any options except difficulty from the main menu.
I got the badge, but it was harder for me than it should have been. All rapid fire weapons screws up the game for me when trying to move and shoot, causing me to lose control of my character, thus walking off into random directions and of course into enemies and shooting in random directions, so I am killed. So I had to only use a shotgun and pistol.
Hey, I spent 10 hours getting 10 million and now the score was deleted. At around 4 million and then again around 8 million I was getting shields like crazy and would have to let the ball pass four times before the shield would be gone. Free lives should not exist if you want this game harder.