In view of that I am extremely dissatisfied with a remake of map "Little Trouble" in Serious Sam 3, Has decided to make the "correct" variant.
Recommended amount of players: 4-12
Productivity of the computer: Low
Place files from archive in a folder:
С:\Program Files\Steam\steamapps\common\serious sam 3\Content\SeriousSam3
(Depends on where at you is installed Steam)