Here's another great category of games. Many of these are what are considered "crossover" games.

They're not purely board games, not purely electronic games, and not purely mechanical games, but often have aspects of each to varying degrees. And they're incredibly addictive to play, even for adults.

If you don't believe me, pull out "Operation" at your next get together after your friends have had a few glasses of wine!

Slightly newer, but just as much fun, are classics like Run Yourself Ragged and Mousetrap.