How do I host offline LAN mode Danger Zone or at least use DZ maps in DM mode?

I tried to use

game_type 6; game_mode 0; map dz_blacksite;

or

game_type 6; game_mode 0; changelevel dz_blacksite

and

game_type 6; game_mode 0; changelevel dz_blacksite; sv_dz_team_count 2; sv_dz_jointeam_allowed 1; sv_dz_autojointeam 0; sv_dz_player_spawn_armor 1

but the game ended right after the map loaded

Source