Paranoia is West End Game's classic darkly humorous game of a computer-run society. The editions are more confusing that most. The following number is used here:

1: West End's original boxed set (1984).

2: West End's cleaned up & revised second edition (1987).

3+4: A humorous jump in numbering means these don't exist.

5: West End's poorly revised revision late in their life, now considered an "un-product" (1995)

6: Mongoose's first edition, originally called "Paranoia XP" prior to a cease and desist from Microsoft (2004).

7: Mongoose's revised edition, which had separate rulebooks for "Troubleshooters", "IntSec", and "High Progammers", aka the "25th anniversary" line (2009).

8: Mongoose's rebooted edition by James Wallis (2017).