This is Doom. You know this. The rhythms have been burnt into your DNA by this point: Gun, demons, maze, exit. Now add a ticking time limit forcing careful target prioritisation and precise movement and a level full of floating tokens which require collection (most of them, at least) before the exit will reveal itself. This is Skulldash: Expanded Edition, a massive mod re-released for the GZDoom engine today, and it’s really quite brilliant so long as you don’t mind being a little hurried.