Harry Mass Sr. was a member of the Wolfenstein 3D community and the author of numerous mods. His releases include:
As main author/co-author:
- A Long Wall Back
- Abbey, The
- Berlin Express
- Closer
- Death Waits
- Gates to Hell
- Half Way
- Hunt, The
- MIS Step
- Now or Never!!
- SR's Wolf
- SR's Wolf 2
- SR's Wolf 3
- SR's Wolf 4
- Steel Cage
- Step by Step
- Step One
- Step Two
- The Tribute
As contributor: