What is the chance of getting brawlers in a big/mega box vs a brawl box?

Solution 1:

The drop rates are for ONE brawl box. If you open a big box, as it is equivalent to 3 brawl box, it will do three brawl box draws. This means you are able to get max three special items (brawlers, star powers or gadgets). Such as if you are lucky, you get a brawler on the first draw, you get coins and power points on the second draw and you get a gadget on the third draw, then you have some coins, a brawler and a gadget in a box. Similarly, as a mega box is equivalent to 10 boxes, the system will do 10 draws.

Solution 2:

To do it, first go to the mega box in the shop, click on it but do not confirm. Next, press the "i" button and you get your chances (the button in the corner of the window, not the one in the corner of the light blue section). From there, you can check your drop rates.