Stuck in foundry (Blue key not found)

[Bitcoin Baron]

I cant find the blue key on level 3 foundry. I have got the yellow key (but found NO yellow doors), and have found the room with all the lava waterfalls, but I can't find any blue key and my mission objective seems to be behind one of about ten blue keycard doors.

Please be descriptive don't just say "the yellow zone" as there isnt a yellow zone. The map in this game is really really bad. levels dont even connect to each other so it's impossible to tell if theres a way up from one level to the next.

[rawWwRrr]

To get orientation correct, assume you just came out from the main door when you first entered the map. Across from you is the blue zone area to your upper left, a walkway in the center, and second area up high to your right. Cross that walkway to the second area. Go to the right, walk forward a bit and you'll see a stairway leading up to a door that opens with the yellow card.

That should get you back on track.

And all the areas do connect to one another. Some are just locked away behind doors. There's a series of rooms under the blue zone that can get confusing, but it's a far simpler map than what it first feels like.