Drop7, iPhone/iPod Touch - £1.79

Drop7, iPhone/iPod Touch - £1.79 (opens in iTunes)

Discussed on this week's ListenUP, Drop7 gives you a 7x7 grid in which to drop numbered spheres. If, when a sphere is dropped, the number of any sphere on the grid is equal to the amount of spheres on its line, horizontally or vertically, it disappears. After a certain amount of moves, the board is shifted up one square and another line of blocks is added.

I don't want to call it a mash-up of Tetris and Sudoku, because that sells it as something trying to pander to the popular, and it's definitely its own thing. It's one of those things that's very hard to explain, but luckily enough there's a free demo available here (opens in iTunes). Isn't that fortuitous.