I can not find any information about the "wristwatch tetris". The only wristwatch tetris I find on google is http://www.geekologie.com/2007/11/20/tetris-pong-watch.jpg which seems to have a 14-column wide playfield.

// aioobe

never mind, I think I found it: http://buzzworthy.mtv.com/wp-content/uploads/2007/09/1351233218_0ddaaa94d5.jpg

// aioobe

If top 20 rows are hidden, I wouldn't call it 10x40, and so wouldn't NullpoMino.

When we talk about the playfield dimensions, we include the hidden rows. 108.71.120.73 04:39, 29 August 2017 (PDT)

I don't think that's leading. Because previewed space can be much smaller than real space, it's misleading.

Should we only use the visible rows? 108.71.121.45 11:17, 29 August 2017 (PDT)

Separately visible and hidden rows, like in NullpoMino rule editor.