Version 1.50 (18 July 2003)
  - Created a setup program to find the right speed and keyboard setting.
  - Added an optional training level.
  - Added 2 new levels.
  - Added a new end to the game!
  - Changed some of the weapons.
  - Added the Internet High Score Code to the high score posts.

Version 1.40b (8 Novembder 2002)
  - Added checksums to hscore.dat

Version 1.40  (25 September 2002)
  - Different kind of enemies.
  - "Intellegent" enemies.
  - Added more weapons.
  - Better error checking when reading level.dat.
  - More advanced highscore list.
  - New delay method. Now the game will go at the same speed
    on all computers, even on the IBM PS/2. I think.
  - Added 3 new levels. Changed quite a bit some of the old levels.
  - Now you can define your own "weapon levels" in level.dat
  - Changed the weapon system so it uses three "weapon pods"
  - Added the -warpto flag. Removed the -hs_list and the obsolate 
    -smartenemy flag.
  - Fixed some bugs.
  - Removed the documentation on how to edit level.dat, since the format of
    level.dat has changed, and I don't have time to update the documentation.
  - And some other things.

Version 1.32 (2 September 2001)
  - Changed the name from Space Invaders NG to 
    WTS Invaders.
  - Changed a bit on the included highscore table.

Version 1.31 (14 Mars 2001)
  - Changed the name from Space Invaders 3000 to 
    Space Invaders Next Generation (NG)
  - Now there comes smoke from a damaged enemy.

Version 1.3 (10 December 2000)
  - New keyboard handler. This improved the game a lot! 
  - Different kind of weapons has now different kind of "bullets".
    (before a laser beam looked the same as a missile)
  - Improved highscore table.

Version 1.21 (18 May 2000)
  - Corrected some errors in the GAME CONTROL section in the documentation
    and in the online help.
  - The command line parameters are no longer case sensitive.

Version 1.2 (27 Mars 2000)
  - Now there can be several enemies on the screen at the same time.
  - The game now has a Main menu.
  - Added some on-line help.
  - It is now possible to turn on/off the sound while playing.
  - Two new levels.
  - Changed the format of LEVEL.DAT
  - Changed LEVEL.TXT
  - Changed the name from SPACE to SPACE INVADERS 3000.

Version 1.1 (28 July 1999)
  - Added High score table.
  - Changed the format of LEVEL.DAT
  - Added documentation how to edit levels (LEVEL.TXT)

Version 1.0 (4 May 1999)
  - First public release.

Version 0.0 (8 June 1998)
  - First alfa version.