A heads up for the Intercasino bonus whores it do it via the casino rather than poker (will be the same on the other Crypto sites though).
According to this months inside edge magazine in the UK, the best house edge game isnt Blackjack but is Pontoon with a edge of 0.20%. I have no idea if it is 100% correct or if it is better than the blackjack but someone with a bit more knowledge on this may be able to add or confirm.
It maybe that this is the game to clear the bonus with, its a UK version of blackjack.
Pontoon Strategy