On 0 servers with real players, out of 1 Steam servers that run it now, farms and empty ones included. Checked 07:25 UTC.
surf_mario_castle is a surf map: you slide along sloped walls instead of running. It is not one of the maps that come with the game, so servers send it to players when they join.
Over the last 30 days surf_mario_castle was the #3819 map on CS 1.6 Steam servers, with <1 real players on it at any moment on average - 0% of everyone playing. It ran on about 0 servers with real players at a time. Right now 0 people play it on 0 servers. It is busiest on Saturday around 19:00 UTC and quietest on Monday around 00:00 UTC.
Right now 0, on 0 servers from the Steam server list. Over the last 30 days it had <1 real players on average at any moment. Fake servers and bots are not counted.
On Saturday around 19:00 UTC. The grid above shows every hour of the week in your own time zone.
The busiest right now: Munnopoly | Surf | 100 maps + vote (0 players). The full list is under "Servers running it now", and every server has its own page with its history.
de_dust21,624 players on average
de_inferno207 players on average
de_dust2_2x2115 players on average
de_aztec89 players on average
fy_snow78 players on average
de_nuke71 players on average
de_dust59 players on average
cs_assault53 players on average
de_mirage52 players on average
de_train47 players on average
fy_pool_day45 players on average
zm_foda42 players on average