Here are some of the games that I most enjoy, arranged by type. Some of these are sentimental favourites from childhood, while others are played regularly even now.
Hopefully they will also provide some sense of the breadth with which I use the term.


Physical Games
  Five-a-side Soccer
Croquet
Pool
Chalk Chase
Down Ball
Treasure Hunts

Board Games
  Civilization
Chess
Chess Variants
Shadows Over Camelot
The Lord of the Rings

Card Games
  Canasta
Up and Down the River
Five Hundred
Chancellor
Napoleon
Hearts
Spider
Autumn Leaves
Dominion

Computer Games
 

Civilization III
Reach for the Stars
Seven Cities of Gold
Dark Castle
Marathon
NetHack
Sil
Lemmings
Marble Madness
Ultima (III and VI)
Pool of Radiance
Battle for Wesnoth


Miscelaneous Games
  Werewolf (also known as Mafia)
Unlimited Questions