Playing ZEROS is really simple.
The goal is to set all the tiles to zero.

Zeros2    zeros3
To achieve this you can swipe rows and columns, horizontally and vertically.
If you swipe a row left all the tiles of the row are decreased by one, if you swipe right tiles are increased by one.
The same is valid for columns.

zeros4    zeros5
Very first levels are straightforward, but complexity rises swiftly.