I only have 1 laptop, and want to play with another person.
No joystick/mouse/anything.
What games can I use?
As per meta: Don't add a new answer, but edit the Community Wiki answer.
Requirements:
- Fun with two players
- Enjoyable without spending an hour learning the rules
- Free, open source is ideal
- Usable offline, no flash-based nor online-based games.
- Link to Ubuntu package appreciated
- two-players-at-one-keyboard or hotseat or anything else OK
