This game is basically lacking, but it approximates what you might expect from a rushed-budget pool game. [more inside]

User Rating: 3.5 | Underground Pool DS
The physics of this game reminded me of mini-pool more than actual billiards. That is, the balls are small and light-weight, which makes it difficult to judge the strength of your shots. If you've ever played on those order-by-mail tables for mini-pool, then you might be able to get the hang of the accelerated gameplay.

Don't get the Gamespot reviewers wrong... It's easy enough to make your combination shots, but you'll have to painstakingly line up every other shot. Unfortunately, as they say, the touch screen controls does not work towards the edges of the screen. If only these billiards games would make the inputs small enough, in order to line up shots without repeatedly tapping back and forth on the d-pad!

The computer opponent seems only able to make two kinds of shots, which compensates for your lack of control. It's best to take each shot from the first-person perspective, and take some time to figure out the strength of your shot. Once you get the hang of this, the game provides a decent fix for pool players.

I think this game was developed by a bad company, but its good enough to play on the go.