Blackjack

Get closer to 21 than the dealer without going over. Number cards count as their number, J/Q/K count 10, and an Ace counts 1 or 11 (whichever helps). Hit to take a card, Stand to keep what you have.

Double doubles your bet on your first two cards and gives you exactly one more card. Split turns two cards of the same value into two hands with a bet each; split Aces get one card each.

When the dealer shows an Ace you can insure for half your bet. It pays 2 to 1 if the dealer has blackjack, so it only breaks even; most players skip it.

Before you bet you can see a hash of your server seed in the Fairness panel. Every result comes from that seed plus your client seed and the bet number. Change your client seed to reveal the old server seed, then use Verify to recompute any round yourself.