Seems easier than 4D: I played on a 16-square single board as if it were 4D, and the "pulled down" numbers from the other (essentially random) board if they lin

Seems easier than 4D: I played on a 16-square single board as if it were 4D, and the "pulled down" numbers from the other (essentially random) board if they lined up nicely, or if I needed new numbers.