Where's My Water? is back with its fourth instalment bringing new level types and featuring Swampy the alligator from the original game.

The game features 100 new levels and uses in-app purchases on free to play levels. The Gator universe has had a makeover with new surroundings housing all your favourites: Swampy, Allie, Cranky and Mystery Duck.

A new Challenge Mode lets you replay levels with explosive new outcomes. Duck Rush mode challenges you to dig as fast as you can to uncover duckies. And Tri-ducking has been improved to be faster with more boosts like Vacuum, Dropper and Absorber - just be warned, you have to pay for some of these.

Where's My Water? 2 is free to download at the iTunes Store now and will be coming to Android, Kindle and Windows Phone soon.