I had a CD witch contained HL, CS and Bots. I had it like 5 years or so. There was worldcraft in HL folder. But i didn't know that
Then i was looking for somethng in that cd and noticed worldcraft i thought wtf? Installed it tried to do something but failed. Then i forgot about it. Few years after i forgot about it i remembered it (surprise), installed. Then i read worldcrafts help file (you know old worldcraft had example maps and a help file with tutorials!) Then i thought i need something more and googled and found twhl. I learned many things here