Normally I think of an Idea, map alittle, and then quit. But this idea is different, I feel I can finish this. It's just a basic idea, and I don't have a name or anything yet.
Basically I have two starting points.
1. You are involved in a research facility, and something goes wrong with the equipment, causing a portal to either A) Hell, or B) another dimension. It turns out later that the whole thing is a conspiracy and someone A) a demon, or B)an alien wanted to destroy your world. You find little bits of info about the plot as you play the mod. Your mission is to shit down the portal by either A) travelling to Hell, which would be SO fun to map, or B) travelling to another dimension. I don't know the ending.
2. Same as above, except you are hired by the government to shut it down, military style.
Depending on what path I choose it will either be A) Horror, or B) Sci-Fi. I'm thinking of reskinning models and changing their size and importance, like a little garg replaces the alien slave, and the slave is huge and dangerous. What do you think?
p.s. Stealing ideas is bad, think about why your head isn't on right.