Best strategy to raise cash

[articus]

I've seen screen shots with loads of beam towers and tons of bomb launchers!
How do you get to that cash level?
I always try to upgrade my weapons gradually but every wave is getting stronger so I keep spending on upgrades (or selling the bomb for laser when the flying parasites waves come).

In short, what is the best strategy to start earning cash to a good level? Is it worth buying a drone in the early stage? My problem is when I buy a drone, I have less cash for the defence so my barrier gets damaged so the drone spends time repairing it instead of harvesting cash!

I'd appreciate the advice of some Sentinel millionaires...

Thanks guys, great game by the way, well done!

[matt553]

On Compound I can usually get by with 2 laser towers, fully upgraded, until wave 13. With minimum upgrades and towers I can raise enough cash by level 30 to get 1.8 beam towers... usually I have to sell a laser tower to get two. I'll try and post a video if I have time... to where I position my towers and when to upgrade.

I'd say it works 90% of the time. Since the waves are random, a creature gets by every once in awhile.

[articus]

Thanks for this,
I also try to keep up with only 2 lasers as long as possible, but as of wave 12-13 I usually need to beef it up with 1 bomb.

What about the drone in early waves?
It is supposed to raise cash while the structures are untouched. But at the same time it weakens my defenses so the waves go through and put some damage (and therefore cancel the drone benefit?).

I am currently playing on Perimeter and Compound, Medium level.

[Nitto]

im no expert at this so i mainly play the easy levels. the strategy i use is to buy two guns in the first wave. then as i get more money i upgrade each gun at the same time, continuing until they are fully upgraded. then i buy another pair of guns and do the same. this usualy holds off the waves for quite a few rounds. eventualy after they start to get past the guns i add a freeze ray. then a bomb. by this time you should have enough fire power to sit back and collect cash for the drone.

[matt553]

I usually don't buy drones until the later rounds.. like 30+. I really haven't found any good strategy on when to purchase the drone. I think once the update with drone priorities comes out... I'll work on that a little bit more.

[speedfirst]

Never ignore the power of interest bonus, even it is only 5%.

For example, if you buy a laser tower once you can afford it, you always have your fund clear up and thus no interest at all. On the contrary, if you have 2250, and buy laser with 250, you'll get 100 for each wave. During many waves, for instance, you'll get a lot of extra if you don't run of money. Once it is done, you money are just like snowball, larger and larger. In mathematics, it is called "geometric sequence" with increase factor 1.05. So your fund as much as possible, and buy anything when it is absolutely necessary only.

My experience is that in the 10th wave, 200; 30th wave, 800; 60th wave 2000; 90th wave, 5000~10000.