The primary "PSP feature" for GMod is this comprehensive asset pack, which includes:
A German developer created "Spawnpatch" around 2009. It allowed users to load low-poly models (converted from Half-Life 1, not Source) into a flat gray grid map. You could: gmod psp
But the sticker on the box—handwritten in Sharpie—caught my eye: Garry's Mod: Portable Edition. The primary "PSP feature" for GMod is this
However, Sony’s official PSP Remote Play was designed for the PS3, not PC. To stream GMod from your gaming PC to your PSP, you need a workaround: The Engine: Garry’s Mod (post-2006) ran on the
To play GMod on PSP, you'll need:
If you want the authentic Garry’s Mod experience on your PSP screen, you cannot run it natively, but you can stream it. This requires a high-end PC running GMod and a PSP with WiFi and Custom Firmware.