I'm just finishing this now (so no graphics yet!) It's about 40% done (but it's fun to play!)
[link]
Instructions:
-Pull the level on the right (click it and drag the mouse down)
-When the 'barrels' stop try and find a correct combination; click 'BET' if you think that combination is ok
-It costs '25' to play each game
-You lose '50' if you're wrong
-You gain '100' if you're right.