'Where's my wallet?' 'Where's my car?' 'Where's my mobile?' These are all questions you'll probably ask yourself at least once a week. If you're lucky.

'Where's My Water?', meanwhile, is an issue that's only just arisen in my household. The reason? It's more addictive than jellybeans.

Disney's iPhone physics-puzzler Where's My Water stars Swampy the Alligator, an eccentric reptile with a hygiene obsession and a set of faulty bath pipes.

To help Swampy bathe in peace, comfort, and unpolluted water, you'll have to guide 'his' aqua through 100 levels filled with algae, triggers, and traps.

Make that 120, actually.

That's because the creators of Where's My Water? have issued the next chapter in the Swampy saga, entitled Change is Good.

Along with the 20 extra levels, Change is Good challenges players to seek out a batch of new collectibles and introduces them to the Fluid Converter: a gizmo which turns polluted water into fresh water, and vice versa.

See why we awarded Where's My Water? full marks last month. Then agree with us in the Comments section below.