My ideal UX for grids are click counters of things in 2 by 2 categories.
My concrete example are turtle tracks. While I'm capturing a geotrace in the background, I walk along a beach and tap to add one count to a relevant cell. My columns are turtle species, the rows are types of tracks.
I want to use each cell as a click counter (value plus one) and also be able to correct a misplaced click (value minus one). For this, I need to see the value (an integer number), a large plus button and a smaller minus button.