Cave Horror Project modpack Minecraft server

Cave Horror Project is a horror survival modpack for Minecraft 1.20.1 on Forge. Its CurseForge page lists over 240 quests across six chapters, horror mods such as The Anomaly and Cave Dweller, and Simple Voice Chat with walkie-talkies. This guide covers the first pack, Cave Horror Project 1. You install the server from the Modpacks tab, using the pack's own server files.

Checked against Cave Horror Project 1 v3.6.1 (the CurseForge file dated 1 October 2026) on Forge 47.4.23 and Minecraft 1.20.1, October 2026.

What the pack needs

• Minecraft 1.20.1 with Forge 47.4.23. The server pack ships Forge already installed in its libraries folder. Minecraft 1.20.1 runs on Java 17, which the panel picks for you.
• Memory. The CurseForge page gives no figure. The server pack's user_jvm_args.txt has only a comment that says a good default for a modded server is 4 GB, and its -Xmx4G line is commented out. The panel sizes the heap from your plan anyway. Read how much RAM a Minecraft server needs and check the Minecraft plans before you install.
• Disk space. The server pack is a download of about 437 MB and unpacks to about 486 MB. The download sits on your plan's disk while it unpacks, so you need room for both.
• The same pack version for players. Players need the same version your server installs. This guide was checked against v3.6.1.

Install the server

Press the CurseForge button in the row of sources on the Modpacks tab and search for Cave Horror Project. Pick the one whose title starts with Cave Horror Project 1, since Cave Horror Project 2 is a separate pack for Minecraft 1.19.2. The popup names Forge and Minecraft 1.20.1. For the version list, the backup and the rest of the window, see Install a CurseForge modpack.

The server pack carries Forge's launch arguments in its libraries folder, and the panel starts the server from them with its own memory flags. The pack's run.sh and user_jvm_args.txt are not used.

First start

The server pack includes an eula.txt already set to true. If the panel still asks about the EULA, accept it.

Voice chat

The pack includes Simple Voice Chat. Its config/voicechat/voicechat-server.properties sets audio to port=24454, a separate port from the game. If your plan includes extra ports, add one under Settings then Network ports, set port in that file to the new number and restart. How to add an extra port explains the card.

Common problems

• A player cannot join. Check they run the same Cave Horror Project 1 version as the server, on Minecraft 1.20.1 with Forge, then compare their mod list with the server's mods folder.
• The server crashes at boot. Find and read a crash report shows how to name the mod at fault.