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 can pay quite differently.
Bingo replaces the pick with a printed card and the draw with a caller. Numbers come out one at a time and each player marks a card against them until a pattern completes — a line, two lines, or the full card. A ninety ball game and a seventy five ball game differ in the size of the field and in the patterns that count, which is why the rules sheet matters more than it looks.
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.