He started out with 0 from birth and hadn't aquired any until creating the alpha release of Blockland. Once the first brick was placed in game, he gained one brain cell. With every individual peice placed within his digital Lego world he gains another. That was 16 years ago (roughly)... I can only imagine the throbbing brainpower he posses now. But I do know for a fact that we no longer refer to him as Badspot... He is Badsgod.
His only weakness is watching anime, which reduces his braincells by roughly 5 points per minute. He's watched a lot, over his life, so we really can't make a conclusive estimate I think.