zenki said:

I use "stuff up 25%" and use "stuff up 10%" from the depot ! 

But the result only increased by 10%!? 

In the end it chooses lower indexes! 

Only 25% increase in resources! ? 

Exceeding 25% is not possible!? 

I use "offense enhancer +10%/4h" and "offense enhancer +20%/4h "   ->  results only 20%!? 

well certain boost are for different things you can have a plus 25% ration production and -25% ration reduction don't get confused, they are two different things. if you activate two 25% 1 day boosts you won’t get 50% for 1 day you will have 25% for 2 days

As for the offense enhancer they do not stack you can’t have 2 on at once and before you try to put another one on also if you try to activate it you'll get a warning.

myself said:

I do not see anything here reached level  "ultimate starting guide for new players". Want to maintain, you need to use the card, $ 300 is not enough to achieve in the rankings.

Commander I don't exactly understand what you're saying ,if you're talking about getting experience as you build buildings and research you will get exp and gain level, $300 is not needed