If you are looking to play online, this specific version may not connect to official Steam servers unless you are using a LAN emulator like Hamachi or Radmin VPN to play with friends.
Ensure your DirectX is up to date. This game requires at least DirectX 11. File: Nidhogg.2.v23.11.2017.zip ...
Sometimes antivirus software flags the Steam_api.dll (if present in the folder) as a "false positive." If the game won't open, check your antivirus quarantine and "Allow" the file. 4. Game Features in this Build If you are looking to play online, this