Usually when you hear that a game has a bunch of new water levels, it's a call for trepidation, especially when the liquid appears as brackish as it does here. However the Dark Liquid Level Pack, an add-on to Smart Code Games' popular physics puzzler Liquid Measure 2, is just as refreshing a drink as the original. Not much is changed, but, as my amateur plumber dad can tell you, it isn't wise to fix a pipe that isn't broken.
As before, the goal of the game is to direct flows of water into the proper receptacles without spilling any. As you might expect, the (now suspiciously-dark) water flows downwards unless directed by another implement. Using the mouse, drag and drop the various items to set up the liquid's route. In addition to the standard pipes and pots, there are other pieces available for use, including Overflow Pots, which catch a certain amount of water before releasing the extra, and Water Splitters, which splits the stream into two equal streams starting with the direction the arrow upon it is facing. You click the pipe on the right side of the screen, or hit the [spacebar], to turn the water-flow. 31 new levels are included, so water you going to do?
Level packs have a not entirely unjustified reputation for being "just like the main game but harder", and the levels included in Dark Liquid don't break this trend. This isn't entirely a bad thing: I quite enjoyed the original Liquid Measure 2, but felt that the easy challenge level and high number of tutorial levels worked against it. Dispensing with unnecessary instructions and ramping the difficulty up to "medium" is exactly what the series needed. Certainly, some levels are gimmes, but there are some real head-scratchers here, and it's for the best. I would have liked it better if the challenge was more progressive (it often felt like super-easy levels came right after the more difficult ones), but all in all, it's a satisfying addition.
There remains little to say. If, like many out there, you enjoyed Liquid Measure 2, you will enjoy the additional levels, and that is that. There seems to be little reason for them not to have been included in the original version, but I find it hard to get too annoyed at having more of a fun game to play. Now, if you excuse me, I think I hear my faucet dripping...