They are taking advantage of the scoring system.

Each creep is worth 1 point times your multiplier (in the middle top of screen).

The multiplier goes up by 1 for each creep killed.  Unless you kill to very near its exit, in which it is worth more... like X5, X10 and more... depending on how close it was.  So killing a creep right at the last moment is worth a lot of multiplier bonus.  And that just keeps racking up the points!

Build Towers from the Exit towards the Spawn instead of the other way around.  This is risky, hence why the scoring system rewards that!

I don't know how openfeint works but it would also be great if it saved all of our highscores. I write down some scores now to see what strategies worked the best so i can make a better score.

How do you get such high scores on this game??? on the opening easy level my high score is 45,695, and I kill every creep, most near my base, yet the highest score on open feint is a rediculous 122,935,800 - which to me seems to be mathematically impossible given the number of waves and creeps!

I really dont understand how to get high scores.  I have just completed all of the easier levels, but my scores seem to be absolute rubbish compared to everyone else on open feint???

Please help, coz this is a cool game!

Cheers

 Those incredibly high scores come from two things:

1. Increasing the multiplier by killing the creeps as closely as possible to the red exit point. Killing a creep just before it explodes in the red adds 50 to your multiplier.

2. Juggling. WTF is juggling? As best as I can describe it is this...you block all possible paths to the exit except for one. You allow the creeps to get almost all the way to the exit, then you sell one of your towers way back near the beginning, which opens up an alternate route to the exit. Then you quickly place a tower to block the first route. Then the creeps will go all the way back to the beginning to the newly opened route. Once they get there, you sell the tower near the exit, and place a tower near the beginning blocking that route. The creeps have no choice but to move back to the only open route. So they run the gauntlet of all of your towers again. To me, this is incredibly boring, and it's only for the people who want to see themselves way up on the leaderboards in that OpenFeint nonsense. I HATE OpenFeint in the game, and even though you can refuse to upload to OF, you still get the "advertising" in your face. I'm sure that OF probably pays a premium to game developers to route users to their service, so I doubt if you will see it removed or completely disabled. But I digress...gamers use the back-and-forth-back-and-forth-place-a-tower-sell-a-tower method to get the huge scores. You can juggle all day and get a stupid high score if you want, but frankly I have better things to do with my time. In one of the levels, you MUST use the juggling method to beat the level, so you will get a chance to try it out for yourself. (It's the level with the "?" and "!" in it, the name of which escapes me ATM.)