How to level up to level 3 in few seconds?
Not a great matter.
Just build a market stall, let's suppose a Fruit one.
Then keep SHIFT button pressed on your keyboard, and with your mouse go to change that market stall stock.
Keep in mind that, different than Netropolis, in BossWars you have EFFECTIVELY to change stock not to be trapped in a error...
So now click fast through various stocks always changing it and mantaining SHIFT button pressed... this brief video shows how it works!
In a tabbed browser (it works 100% on CrazyBrowser, i know that it's the same in Maxton, dunno on other ones...) you have several tabs opening while you go on clicking the various stocks.
On the bottom right or your browser window you can have a trace on how many clicks you did (not 100% accurate if oyu are really fast, so that some clicks could be traced as an error, but it gives you an idea without checking your headquarter to see how many actions you did...)
Hope it is of any help for you all, enjoy it!