12.25 after a few attempts on mobile. I tried to use one finger only, maybe I can get much faster with two fingers. on mobile it shows up as a 6x4 array plus a

12.25 after a few attempts on mobile. I tried to use one finger only, maybe I can get much faster with two fingers. on mobile it shows up as a 6x4 array plus a 25th box centered in the 7th row, so the key is remembering what the bottom cell is because otherwise that one doesn't immediate pop out to me. in desktop mode it looks like 5x5, time to test if that is easier or harder on the computer or in desktop mode.