Thanks, dude

Sorry for the late reply, I forgot to do so.

Ok, just after you blow the canisters, head to the left where the slime river flows and break one of the vents with holes. You just then proceed ahead. After this area it is pretty much straightforward.

Any further questions, ask me. Cheers, and sorry again for the belated reply.

Sorry to bother you. But i'm stuck in this level, where do I find the red key? because I don't want to noclip.

Here's where I was last time
https://postimg.org/image/horu9pq21/

You're welcome, I'm having a blast with them.

The last thing I remember doing is opening the port entrance. Although that was quite a few days ago and I could be remembering incorrectly.

Hey, thank you very much for playing my levels.

Yes, this one is pretty long for being in the middle of the episode. But if I may help you, tell me where did you get lost?

To be honest, the FM3X bundle out in Duke sites made significant updates to this map, improving gameplay and decreasing difficulty. You should try it out. Besides, it works on any source port, but was made exclusively on/for DOS.

As much as I wanted to, I could not complete this map. I got lost for over an hour. Even after putting the game down and trying on another day thinking something would happen. I got pretty far into it though and definitely say its a good map.