OldSchool Nightmare is a first person shooter with some old school gameplay ( gameplay like doom, blood, heretic etc... ).
LAUNCHER IS NOT WORKING AT THE MOMENT! USE THIS LINK INSTEAD: 1drv.ms/f/s!Asw5E08ZpMIPgi8AxIgf32UUWnAu
You can now use this installer to help other players to install your maps and also you can install the simple_map_1(Included) I'v showed in the video...