Hi, I'm Invalid nick, some people might also know me as mr.P - which was the nickname I used when creating various HLDM (OP4, AG, CS:S, CS)-levels roughly 15 years ago, some examples are Homeworld - that was featured as LOTW at Planethalflife.com(Google cache), Goldrush, Tear, Tombraider, Snake, OP4_Brave (all featured as LOTW at Planethalflife.com)
I'm also the creator of de_mist and cs_rush
GG HF!