Good Game

I like to play b&w and also colored one very much. Only I would like to able make the playing square bigger. Its very hard to select small parts on phone.(Iphone5) especially while playing 15x20 and upper ones. Im trying hard to put my finger on related area and if I dont notice early enough that I have mistakely done it, its difficult to find where I did the mistake.
Thank you

Nillytheone about NonogramZ Japanese crosswords, v2.0.9