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
Racing
Bump Race - bumprace package
Super Tux Racer - supertux-stable package
SuperTuxKart
Armagetron http://armagetronad.org
Worms-like
Hedge Wars - hedgewars package
Warmux - warmux package
Slingshot
RPG
Battle for Wesnoth http://www.wesnoth.org/
Lordsawar - lordsawar package
Wings 2 http://www.wings2.net
Tetris-like
Block Attack - blockattack package
Platform games
JVGS (http://jvgs.sourceforge.net/) - not in repository
Fish Fillets (http://fillets.sourceforge.net/) - in repository
Sport
Neverputt
Emulators