Swordquest games in order

All 4 games of the Swordquest series in the order they came out, from Swordquest: Earthworld (1982) to Swordquest: Waterworld (1984).

1. 
   Swordquest: Earthworld2600 · Atari, Inc.
   1 Oct
2. Swordquest: Fireworld2600
   Feb 1983
3. 
   Swordquest: Airworld2600 · Digital Eclipse
   1983
4. Swordquest: Waterworld2600
   Feb 1984