If you are playing Monopoly, you are playing a board game. Playing monopoly is a sufficient condition for playing a board game, but not necessary. However, playing a board game is necessary for you to be playing Monopoly, but not sufficient for us to infer you are playing Monopoly. But if you are not playing a board game, you are certainly not playing Monopoly either.

5/5 on hardest, let's go!

4/5 on hardest, you know what, we'll take it!