[zeitgeistcowboy]

There’s a game on Apple Arcade called stitch if you want a much larger and more difficult version of this.

[cgio]

Stitch is much easier than the advanced levels of this one. I would know having spent quite a few hours on stitch trying to get to top 1000. Also stitch had introduced shikakus at some point.

[anigbrowl]

You can choose other skill levels for bigger grids