Need help with map downloading

So I downloaded some maps, unzipped the maps, placed them in the map folder. but when I play them there are these big red “ERROR” everywhere and black and purple squares. could anyone tell me what I’ve done wrong?

I’m very new to Gmod >.<

Some maps may require you to have other games such as Counter-Strike:Source or Half Life 2 Episode 2.

Even the maps with “gm” in the name I guess

If you want to be safe you need:

hl2, ep1, ep2

ahh, ok thank you :slight_smile:

Will probably get those games then ^^