

Some casinos will run multiple games to entice players to wager more. You mark your ticket and tell the dealer to enter it in the "red game", "green game" or both. Basically it's a way to increase action (wagering) without having to increase floorspace and staff correspondingly. There are two separate sets of balls and two KENO boards, but only one KENO lounge and set of dealers. The casino figures you won't want to just play one of the games because you "know" if you play just the "red game" your numbers will come up only on the "green game". So players tend to bet on both games, increasing the house's take. Mathematically there's nothing special about playing both games, though sometimes casinos offer prizes for hitting on both games. You can calculate the odds of hitting on both games by multiplying combinations that pay off. For example, the chance of catching 4 out of 6 is 0.02854, so the chance of catching 4 out of 6 in 2 simultaneous games is 0.02854 x 0.02854 ~= 0.0008 or 1 in 1228.
Video KENO offers the same odds as regular KENO, but the payoff scale may vary from the casino norm. You can use the math section to calculate your return from video KENO and compare it with the return from the casino's live game. Often you can find video KENO games where a casino doesn't have a live game, and the bet size is often lower. Nickel Video KENO games are not uncommon.
Here's one from the "Believe it or not" school, and a true one.
Back in the '60s KENO games featured a maximum payout of $25,000 per game. One Friday night at Binion's Horseshoe they had back-to-back $25,000 winners. Word got around Fremont street mighty fast. By 6am Saturday morning Binion's had made far more than $50,000 profit from a KENO game that had suddenly become the most popular pastime in downtown Las Vegas.
More recently a Canadian casino was "hit" for a fair take by someone who noticed the machines always produced the same numbers in the morning. (Does anyone want to send me the details?) Basically the machine was missing a computer chip and the casino had turned the machine off at night. So in the morning the random numbers were always started off from the same base instead of keying off something truly random like the time it took for a player to feed a coin. But the guy who discovered this got a bit too greedy and hit too many jackpots, and the truth came out.
KEN0 Gambling is the game of choice for me. Cheap and easy to play and gives me the most excitment, UK.