for those looking to hustle into promotion offers in twitter the best way is probably turning on alerts
I tried once or twice with duelbits promos there and it "sold out" just too fast, when I arrived all the coupons were already gone
better luck next time
I haven once tried to enable the notifications for duelbits tweets but whenever they drop some giveaways the users rush who are most of the time active there and you will see hundred of likes and rt within few minutes.But still you can try with your luck to see if you get a chance.In free redeemable codes you can get chance if you are fast so it could help you.