There have been a number of implementations of the “pipes” style of game on handhelds over the years, and they mostly tend to play the same as one another. Like a lot of these sub-genres, then, it really becomes a matter of which one you like best. For me, Gas Tycoon is one of the better implementations I’ve played in the past couple of years. It’s nothing fancy, but there are a lot of challenging levels, there’s no timer so you can think about what you’re doing, and you actually get rewarded for beating a level in the fewest number of moves possible.