This led to Carmack expressing his thoughts on the growth of the mod community since the days of DOOM. Discussing the technical difficulties that some parts of Q3A present to mod developers, Carmack explained that some of the inherent technical obstacles in mod making for the Quake series served as a sort of litmus test for amateur developers--if you didn't enjoy unlocking the secrets that enabled you to make the most basic of mods, you probably weren't going to enjoy making anything larger than that