У вашего броузера проблема в совместимости с HTML5
PWAD: 50 Monsters (50monstr.wad)
IWAD: Doom II: Hell on Earth (doom2.wad)
Map29: The Finest Joke Is Upon Us
Difficulty: Ultra-Violence
MODS:
HXRTC HUD 7.0 Classic Doom Version (HXRTCHUD_CLASSICDOOM_V7.0.PK7) https://forum.zdoom.org/viewtopic.php?f=19&t=47539
PerK's Smoother Weapon Animations Enhanced (Standard Edition) (pk_anim1.wad) https://www.wad-archive.com/wad/PerK-s-Smoother-Weapon-Animations-Enhanced-Standard-Edition
The high resolution Doom sound effects pack (pk_doom_sfx_20120224.wad) http://www.perkristian.net/game_doom-sfx.shtml
Played through GZDoom, getting 100% Kills and Secrets.
Download the WAD here: https://www.doomworld.com/idgames/levels/doom2/megawads/50monstr