Board games for adults or “adult” board games? It seems most are recommending the latter, if you were after the former then recently I’ve played Settlers of Catan, Diplomacy (a really old classic) and Small World. All very involving and interesting but you have to concentrate and think quite a lot. The other similar game which comes to mind is Carcassonne. Those are all board games, but CAH has been mentioned which is a card game – if you’re interested in games for adults in general then other good card games are Exploding Kittens (actually that one’s really simple and inoffensive, could be played by kids) and Organ Attack.