Blackjack

Atari's Blackjack employs a variant of blackjack rules that is so extremely unfavorable to the player, that it would almost certainly never be seen in a real casino because no one would play with them.

Splitting pairs is not allowed, and even more substantially, draws are won by the dealer (your bet is not returned to you if you and the dealer get the same card total and neither busts). This represents over a 10% house advantage.