This kind of thing has been going on since the original Quake (and possibly earlier). Gameplay resources - models, textures, maps, sounds, etc - were stored as

This kind of thing has been going on since the original Quake (and possibly earlier). Gameplay resources - models, textures, maps, sounds, etc - were stored as relatively simple “pak” file archives [0]. You could easily add resources and even overwrite existing ones simply by adding additional pak files to the game directory. One of the easiest things you can do is simply replace one model for another. There’s a power-up [1] you can get that makes you completely invisible except for your eyes. But just replace “eyes.mdl” with “player.mdl” and invisible players become plain as day [2]. You can do even more with custom models. Add big sticks along each axis to see enemies coming from a mile away. Make the skin glow-in-the-dark fullbright [3] white. Cut holes in the map to see through walls. Put it all together and you can see what a difference it makes: - DM3 normal [4] - DM3 with hacks [5] 0: https://quakewiki.org/wiki/.pak https://quakewiki.org/wiki/.pak 1: https://quake.fandom.com/wiki/Ring_of_Shadows https://quake.fandom.com/wiki/Ring_of_Shadows 2: http://quakeone.com/forum/quake-talk/quake-central/9304-eyes-cheat http://quakeone.com/forum/quake-talk/quake-central/9304-eyes... 3: https://quakewiki.org/wiki/Quake_palette#Colormap https://quakewiki.org/wiki/Quake_palette#Colormap 4: https://youtu.be/BPiVVtRRsyk?t=8m57s https://youtu.be/BPiVVtRRsyk?t=8m57s 5: https://m.youtube.com/watch?v=hf94PbE-b9I https://m.youtube.com/watch?v=hf94PbE-b9I