1) You have the retail version, but it has five episodes, not four. The shareware version has one. And the difference between them is that the full version has a level editor, 5 episodes, and costs money, whereas the shareware version has 1 episode and that's pretty much it. Oh, and I'm pretty sure Spaz is only available in the retail version.

2) I don't know, I never bought those.

3) J00 NEEDS TEH NEW SOUNDCARD =O