This is a great little supplement for GMs looking to add some flavor for characters, especially the betting kind. It's a short read with two simple dice games that NPCs may be playing or more interestingly that your players can play to pass the time.
Some of my players aren't as into the roleplaying portions of the game and end up heading off to the local tavern for some gambling. Though I'm sure I could have come up with some games for them to play rather than a simple skill challenge, this supplement gives two good examples with the background that goblins often play these with marked caltrops. A little fluff and a little crunch. My kind of supplement. Break out the d4's and ante up.