Frontline Defense Special Ops

I really enjoyed the game, it was fun, and the graphics are awesome. I like how you can essentially choose your own difficulty level with the bonus start credits. It would be quite a challenge to beat the game without purchasing them, and making it through mission 14 without losing health. You can buy just enough credits to help you finish the game. Or, if you want total annihilation, you can build up a massive start-up credit amount. You can replay the first few levels with the least number of upgraded towers for a maximum score, which gives you the most credits to buy bonus start funds with (more credits at end of mission = higher score = more credits). I also like the fast-forward button and how it doesn't slow down my old laptop, even with all the action going on, unlike many other flash games I've played with much less action.

so i cant buy an upgrade that cost 100 when i have exactly 100???

As has already been noted, buying 'extra starting cash' is the way to go.....AFTER you buy the machine gun! Not much will get past a pair of fully upgraded machine guns and if you throw in a sniper tower or two at max upgrade as backup, well you can virtually walk away and let the game do it's thing, on the first four or five levels at least.

hmmm...do I buy extra starting cash and plow right through w/ boredom or do I try and mix things up a bit? decisions, decisions, darn these decisions!

So the "extra starting cash" upgrade is selectable an unlimited number of times? You realize that it takes no time at all to set up an auto-grind that gives you near-infinite cash on the very first level? Not much point to anything after that.