Amphetamine. Unlike energy drinks and just trying to stay awake, you don't feel tired at all. You still feel sharp and you remain focused. Admittedly I've never taken it and spent 3 days playing a game, but I did write a couple of my university assignments after I'd taken some amphetamine and I always got decent grades. As an aside it's great for losing weight. Downside is you feel like you're drowning a little bit for a couple of days afterwards. Not to mention youll be dehydrated, sweaty and feel physically exhausted when you stop taking it.
It's probably cut with all kind of shit and absolutely terrible for your health, but it's pretty effective.
Amphetamine or Methamphetamine?
Because in the US we typically just buy Adderall for our Amphetamine and it's lab quality.
i feel like buying d3 is going to be a waste because id never have time to be the gg pwnter like i was when i was 14

I think that is one of the main reason that I don't play any MMOs or competitive multiplayer online games anymore.
I stopped caring about how well I did in games a long time ago.