Serious Sam Third Encounter: Approaching The Final 13 Forbidden Lands: The Sun & Moon Gate (Serious) 

This is the last of the three level of this part of the campaign. It's quite long and pretty difficult in a couple of parts (the square with the Gatling, Plasma etc. especially), but it feels more balanced then the first one and it's cool to play
Serious Sam The Third Encounter is the project of Steam user ,,R'' M1strz M!strzów M, including three campaigns in three different environments (similar to TSE) which show how a possible Third Encounter would have been in the classic Serious Engine graphics with many enemies and weapons scrapped from the SS Alpha and enemies used in the Bright Island campaign. I've already played the first two campaigns on my channel, and this third part is Approaching the Final
Steam's workshop page:
steamcommunity...
I've played this map in blind run at Serious difficulty. When you see the fades, it generally means that I've died there, or that I went back somewhere to pick up some stuff or that I've reloaded 'cause I let myself be hit too much in stupid ways