 I did not make this map I just remade it for CSGO because this was my favourite CSS gungame map.
This is a gungame map I will add the files in the download so you can play this on gungame in single player just put all of the files and folders that are in the zip in the CSGO dir. 
MAKE SURE THAT YOU PUT THE GAMEMODES.TXT FILE IN OR IT WILL NOT WORK IN GUNGAME. PLAY A SIGINGLE PLAYER GAME LIKE NORMAL BUT CHOSE THIS MAP. 