On 1 servers with real players, out of 2 Steam servers that run it now, fakes and empty ones included. Checked 05:16 UTC.
gd_rialto is a community map, not one of the maps that come with the game. Servers send it to players from the Workshop when they join.
Over the last 30 days gd_rialto was the #869 map on CS2 community servers, with 1 real players on it at any moment on average - 0% of everyone playing. It ran on about <1 servers with real players at a time. Right now 2 people play it on 1 servers, most of them on servers in Russia. It is busiest on Tuesday around 19:00 UTC and quietest on Monday around 02:00 UTC.
Right now 2, on 1 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, and Valve matchmaking is not in the list.
On Tuesday around 19:00 UTC. The grid above shows every hour of the week in your own time zone.
The busiest right now: CS2 CUSTOM MATCHES [RU] — CYBERSHOKE.NET (2 players), CS2 CUSTOM MATCHES [SE] — CYBERSHOKE.NET (0 players). The full list is under "Servers running it now", and every server has its own page with its history.
de_mirage43,194 players on average
de_dust217,871 players on average
sandstone_fb14,431 players on average
de_mirage_fps6,328 players on average
awp_lego_25,411 players on average
awp_lego_2_fb4,837 players on average
de_mirage_christmas2,842 players on average
<null>1,271 players on average
bhop_emevaelx31,053 players on average
duels_mirage_1x11,007 players on average
de_inferno900 players on average
de_nuke771 players on average
RU