Hmm, since 1+2+3+4+5+6+7+8+9=45, then if an upgrade over 9 levels became stronger each level on the basis 2+4+6+8+10+12+14+16+18 (each value being a % decrease on a cooldown, rate of fire or something else that is better when reduced), then it would successfully apply a -90% in total if each percentage is applied on the base value. ... If I used the right words at the right place (IMG:[invalid] style_emoticons/default/wacko.gif) (IMG:[invalid] style_emoticons/default/duck.gif)