I like it, Uncletrog. It's simple, could be fun, and can be used for difficult in-game bets and such. Have you come up with any others, since then? I would like to have random bar games throughout my world that allow my player to occasionally have a chance at winning rare familiars and the like. 

There is a dice game called Left, Center, Right that would work nicely. Determine the number of chips/GP that are needed to start then follow the rules.

LCR Dice game link

Players are in a circular formation. The middle of the circle is the center “pot” where chips will be placed during the game.

Before the game begins, each player receives three chips.

Choose a player to be the starting player. This can be the youngest player, or the oldest player, the player who won the previous game, or any other method of your choosing.

The starting player takes their turn, then players will continue taking turns in clockwise order until the game ends.

On your turn, roll the dice. How many dice you roll depends on how many chips you have.

• If you have 3 or more chips, roll all 3 dice.
• If you have 2 chips, roll 2 dice.
• If you have 1 chip, roll 1 die.
• If you have no chips, don’t roll any dice.

After the dice are rolled, you must take actions based on what is showing on the dice.

In the  retail version of the game, one side of each die has an L, one side has a C, one side has an R, and three sides have a single dot. However, you can use any regular 6-sided dice to play by using the following substitutions:

• 1, 2, and 3 are dots
• 4 is L
• 5 is C
• 6 is R

After rolling the dice, look at each die one at a time and take an action based on what was rolled.

• If you roll an L (or a 4), you must give one of your chips to the player on your left.
• If you roll a C (or a 5), you must put one of your chips in the pot in the center.
• If you roll a R (or a 6) you must give one of your chips to the player on your right.
• If you roll a dot (or a 1, 2, or 3), nothing happens.

After rolling the dice and taking actions, pass the dice to the next player.

Example: If you had 5 chips and rolled an L (4), a C (5), and a dot (2), you would give one chip to the player on your left and put one chip in the center pot. You would then have 3 chips remaining.

If you lose all your chips, you aren’t out of the game but you don’t roll any dice or take any actions on your turn. Other players can still give you chips however, and if it comes back to your turn and you have chips again then you take your turn as normal.

Game End and Winning

If at any point only one player has chips remaining, that player is the winner. They get to keep all the chips they have in front of them as well as all the chips from the center pot.

Here's a gambling dice game I call Hunter's Mark (it's just a version of the card game Acey Deucey)

Everyone playing puts down an ante (whatever denomination you want, but usually one coin - 1 sp, 1 gp, whatever)

The 'house' (the DM, unless a PC is hosting/bankrolling the game themselves) rolls 2d20. This creates the target each player is aiming for, as on their turn they'll want to roll between the house's two rolls. So, if the house rolls a 7 and a 16, the target is anything 8-15

After the target has been established, each player may bet additional coins (usually up to a maximum of five times the ante, unless you're in a really swanky casino where people are routinely throwing down thousands of gp on one bet) or leave their ante as is

Play then proceeds around the table, with each player rolling a d20 to try and hit the target. If they do, the house pays out whatever they bet. If the spread of the target was between three and five numbers or less (i.e. you're trying to hit 3-7 or something like that), house pays double the original bet on a hit. If the spread was two numbers or one number (i.e. 14-15), house pays five times the bet on a hit. If the player misses the target, including rolling exactly one of the numbers the house rolled, house collects the bet -- so even if the house rolls a 1 and a 20, there's a chance the player will still lose

If the house rolls a pair on their 2d20, it pays out all antes and you start a new round. If the house rolls adjacent numbers (so the target spread is zero), it scoops all antes

This is a good game, short and simple with great rules. Does anyone wish to crunch the numbers to statistically determine what the payouts should be for each spread? 

thanks for this, AdventureFight! My players wanted to play something at the inn they were at and I did a quick google and we used 38's :)

Quote from AdventureFight >>

I made up a gambling dice game that works kind of like poker. It may already be a game that exists, but I called mine 38's.

Everyone antes in, rolls a secret d20, then does a round of bets with raises, calls, and folds like poker. The next round, everyone rolls a secret d12, and repeat the betting. Last round, everyone rolls a secret d6, then a final round of betting before the reveal. 

A 38 beats everything (20, 12, and 6). A 3 beats everything else (1, 1, and 1). After that, highest number wins. A tie is either split or settled with some kind of blind roll (it never came up so we didn't figure that out lol).

 This looks like it could be alot of fun.  I am going to try this for my first time DMing. 

Thank you my friend