I'd describe Bonza as the lovechild of crossword puzzles and Tetris, developed by an Australian outfit Minimega. Very basic game but if you're into that kind of thing this is potentially hours of distraction.

Normally they charge a couple of bucks for each additional puzzle pack but they seem to be giving most of them away free now.

Start by grabbing the free base app, which already gives you a bunch of free puzzles, and then go in and grab the additional packs (you'll know they're IAP because it'll ask you to "buy" them through iTunes even though they're free):

Bonza

Bonza Planet

Bonza Jigsaw

N.B. they have those bothersome video takeover ads if you're against that kind of thing.

I dunno if it also applies to the Android versions. At a guess I'd say probably yes, but I haven't checked. Feel free if you're so inclined - here are the Android links to get you started:

Bonza

Bonza Planet

Bonza Jigsaw

Android version can unlock the packs with in-game puzzle codes from this page