Most fun game Sam Lam ever taught me. (Big 2 is a close second)
Someone starts (this person has the disadvantage, so when we played, the winner of previous round starts). That person rolls 6 dice. On each roll, you are required to keep at least one of your dice, and you re-roll the remaining ones. You do this until all 6 dice have been kept. For example, you can choose to keep anywhere from 1 to 6 dice on the first roll. If you kept two of them, then you'd re-roll the remaining four dice, and you can choose to keep 1 to 4 of them. And, so on.
Anyway, here's how scoring works. Of your 6 kept dice, you need a 1 and a 4 to qualify. So, set aside the 1 and 4. The sum of the remaining 4 dice becomes your score. A maximum score is 24, with final dice being 1, 4, 6, 6, 6, 6.
The second person goes after the first one, but has the advantage due to the ability to know when to simply just stop trying for higher score while taking on the risk of getting a lower one. Say the first person scores a 17. And, as the 2nd player, your very first roll is 1, 4, 4, 4, 5, 5, you can simply stop right there and claim a win with 18 points.
That's it. It's really simple, and I was entertained. If there's a tie, you ante up again, which builds the pot. When we played, if you don't qualify, you lose an extra dollar. If neither player qualifies, then both throw in an extra dollar for the next pot.
For a 3-, 4-, or more player game, only a single distinct winner can win the pot. So, say in a 4 player game, 2 people score 22, 1 guy scores 18, and another scores a 16. Since there is no distinct winner due to two top scores tying, there is no winner this round. All players ante up again, building the pot. All players are still in the game, and therefore, are eligible to win. You play until there is a single distinct winner, who scoops.
Like I said, fun game... good times.