The third set was all division puzzles. Domino and pentomino were quickly chosen. Tetromino had a lot of options, while triomino was hard to find something interesting.
Dominoes was the most obvious genre. this puzzle caused some issues for my testers. This kind of opening is actually something I like to put in my dominoes puzzles. Once you find it, it runs pretty smoothly.
Divide the grid into dominoes, so that each of the given pairs of numbers appears in exactly one domino.