A roulette wheel for you to learn the evil dangers of gambling!
You start with $20. Click on the grid to place your bets, then click on the wheel to spin.
Every time you click on a grid area, you add one more "bet amount" to the wager on that number or combination of numbers. The yellow "coin" marker will only show one coin regardless of how high the wager. Something to work on, maybe.
The betting grid is somewhat simplified from a version I saw on Wikimedia Commons. I have not implemented corner bets (where you can bet on a block of four numbers) or the ability to bet on a row of numbers.
The roulette wheel image came from Wikimedia Commons.
Thanks to BoltBait for the suggestion to add casino background noises - and for the sound clip.