Reading "How do casino payouts work?" starts with the family it belongs to. Every casino floor carries a few games that are neither cards dealt to a hand nor a wheel with a ball in it. Keno, bingo and scratch cards all work by matching numbers or symbols already decided somewhere else, and casino war sits beside them as the shortest game in the building. They share a shape: the player commits first, and the result arrives in one step.
Casino war is the card game of childhood with a stake on it. Both sides get one card, the higher wins, and a tie offers either surrender for half or a raise to fight it out. A tie is far commoner here than at a card table, since only the rank matters and suits are ignored. Those tie rules carry the whole game: the raise is the only decision in it, and the house keeps its margin almost entirely from what happens when the two cards match.
What these four have in common is where the thinking happens. There is no strategy inside a keno draw or a bingo call, and none inside a scratch card, so whatever a player can control is decided before the round — how many spots to take, which card to buy, whether to go to war. The pay table and the rules sheet are where the differences live, not in the play.
Keno asks for a handful of numbers from a field of eighty. Twenty are drawn, and the payout depends on how many of the picks appear among them and on how many were picked in the first place. That second half surprises people: matching four of five is a different prize from matching four of eight, and each spot count has its own column on the pay table. The table is the game, and two venues running the same draw may pay quite differently.
Every choice comes before the round: how many keno spots to take, which card to buy, or whether to go to war, since the draw itself allows no strategy.
A caller draws numbers one at a time, and each player marks them on a printed card until a winning pattern completes.
Matching four of five picks is a different prize from matching four of eight, so each spot count gets its own column, and venues can pay quite differently.
Each game pays by a fixed table or by its RTP: roulette pays 35 to 1 on a single number, while a slot returns a set share of stakes over millions of spins. The gap between the true odds and the payout is the house edge, which is why the casino keeps a margin in the long run.
The table of prizes still remaining in a run shows what is actually left to win, which says more than the overall odds on the back.