The basic premise of the game is to bring water to Swampy by digging and along the way collect rubber ducks.
The puzzles offer quite a challenge early on already, which is quite nice. One could argue the early levels are too hard to starting players.
There is a lot of variation. Not just the layout of each level changes, but for some levels timing your moves is very important, while for other levels it is very important exactly where you dig.
Graphics are simple, but look really funny.
Feature complete for non spenders. There are some ads, but in my experience not too many, not too obtrusive.
I give Where's My Water? 2 8 out of 10 stars. Fun puzzles, quite challenging.