The Kieffer Bros's puzzler Aqueduct has been updated, adding new level packs to the game. One of these packs is free, while two more are available as in-app purchases.

Aqueduct, which we awarded a strong 4/5 in our review last year, has you playing plumber as you work to restore the flow of water to an abstract aqueduct.

The first level pack, called the Butterfly Chapter, is aimed at novice players, and is free as part of the update.

The Rooster and Snake Chapters, meanwhile, are slightly more advanced, and are available as in-app purchases, priced at 99c each. All three level packs feature Game Center achievements for you to unlock, too.

Also available for purchase is the Master Key, which allows you to tackle Aqueduct's selection of brainteasers in any order you choose. Stump up the 99c asking price, and it's yours.

Minor bug fixes and a couple of user experience enhancements round off the list of changes to this quality puzzler.

You can download Aqueduct right now for 99c from Apple's App Store.