Where the randomness comes from
Every shuffle, reel stop and wheel turn is decided in your own browser using its built-in cryptographic random number generator, the same one browsers use for security work. We take whole numbers from it with a method that gives every outcome exactly the same chance, then shuffle cards with the standard Fisher–Yates method.
Nothing is adjusted to your balance, your history or how long you have been playing. The games do not know whether you are up or down, and there is no setting that makes them looser or tighter.
Two words worth knowing
Return is the share of coins staked that comes back on average over a very long run. A 94% return means that for every 100 coins played, about 94 come back eventually. House edge is what is left: 6% in that example. Over a short session anything can happen; over millions of rounds, the return is where things settle.
Every return printed at Jack Vegas is below 100%. That is not a trick, it is how games of chance against a house work, and the same is true in every real casino.
The four rooms at a glance
| Room | Long-run return | How we know |
|---|---|---|
| Blackjack | 99.58% following the hint | Simulated, 10,000,000 hands |
| Atomic Reels | 92.91% | Exact sum, checked with 25,000,000 simulated pulls |
| Starburst Wheel | 94.00% | Exact: the slices add to 470 over 20 turns of 25 |
| Red Dog | 90.8% to 96.9% | Exact sum, checked with 4,000,000 simulated hands |
Blackjack
The shoe holds six standard 52-card packs, 312 cards, and is reshuffled before a round once fewer than 78 remain. The dealer checks for blackjack under an ace or a ten-value card before you play, which means you never lose a double or split bet to a dealer blackjack. The dealer draws to 16 and stands on every 17, soft or hard.
Blackjack's return depends on how you play, so there is no single exact figure. We ran this page's game code for 10,000,000 hands with the strategy hint making every decision, at 10 coins a hand. It returned 99.58% of coins staked, in line with published figures for these rules. Ignoring the hint, standing on everything below 17 or never doubling all cost you a little more.
The hint follows standard six-deck basic strategy for a dealer who stands on soft 17, with doubling after splits allowed and no surrender. It does not count cards.
Atomic Reels
Each of the five reels has 30 stops: 8 cacti, 7 palms, 6 horseshoes, 4 fin cars, 3 saucers and 2 starbursts, in a different order on every reel. Each stop is equally likely. Because each line's position on each reel is just as random, the chance of, say, exactly three saucers on a line is (3/30)³ × (27/30), and adding up every symbol and length gives the exact return of 92.913%.
To make sure the code matches the maths, we played the real scoring function 25,000,000 times. The measured return was 92.944%, within the normal wobble of a random sample, and 39.5% of pulls paid something on at least one line.
Starburst Wheel
The wheel picks one of its 20 slices with equal chance before it starts turning; the animation then carries that slice to the pointer. The slices add up to 470, so an average turn returns 23.5 coins for 25 staked: exactly 94%.
Red Dog
Every hand uses a freshly shuffled single pack, so the odds are the same each time. After two cards, 50 remain. If the spread is s, there are 4 × s cards that land inside, giving a chance of 4s/50. A pair makes trips with 2 cards out of 50.
Never raising returns 90.77% of opening bets in our simulation, against an exact figure of 90.81%. Raising whenever the spread is 7 or more, the only spreads where the card lands inside more often than not, lifts that to about 96.9%.
What these numbers do not mean
A high return does not mean you will finish ahead, and a low one does not mean you will run out quickly. They describe averages over enormous numbers of rounds. They also only apply here: real-money games elsewhere may have different rules and pay tables, and real money brings real risk.