On 2 servers with real players, out of 3 Steam servers that run it now, fakes and empty ones included. Checked 20:17 UTC.
kz_lego is a KZ (climb) map: you jump your way to the end as fast as you can. It is not one of the maps that come with the game, so servers send it to players from the Workshop when they join.
Over the last 30 days kz_lego was the #343 map on CS2 community servers, with 7 real players on it at any moment on average - 0% of everyone playing. It ran on about 2 servers with real players at a time. Right now 14 people play it on 2 servers, most of them on servers in Ireland and Lithuania. It is busiest on Friday around 16:00 UTC and quietest on Tuesday around 03:00 UTC.
Right now 14, on 2 servers from the Steam server list. Over the last 30 days it had 7 real players on average at any moment. Fake servers and bots are not counted, and Valve matchmaking is not in the list.
On Friday around 16:00 UTC. The grid above shows every hour of the week in your own time zone.
The busiest right now: CS2 KZ #102 [DE] — CYBERSHOKE.NET (TIER 1-3 - EASY, ONLY LEGO (12 players), CS2 KZ #256 [LT] — CYBERSHOKE.NET (TIER 1-3 - EASY) (2 players), CS2 KZ #268 [MN] — CYBERSHOKE.NET (TIER 1-3 - EASY) (0 players). The full list is under "Servers running it now", and every server has its own page with its history.
de_mirage43,370 players on average
de_dust217,959 players on average
sandstone_fb14,462 players on average
de_mirage_fps6,343 players on average
awp_lego_25,458 players on average
awp_lego_2_fb4,834 players on average
de_mirage_christmas2,861 players on average
<null>1,275 players on average
bhop_emevaelx31,058 players on average
duels_mirage_1x11,028 players on average
de_inferno892 players on average
de_nuke749 players on average
IE
LT