Gates to Hell is the sixth mod made by Harry Mass Sr. It was released on September 12, 2000.
It features 10 levels played in a custom EXE based on registered Wolfenstein. The levels are played on Episode 1.
An SDL port was released on December 26, 2014 more than one year after the previous Mass Sr SDL port. Though many more were planned, this proved to be the last SDL port by Andy Nonymous who took a leave of absence in February 2015.