Hero in the Castle of Doom

Hero in the Castle of Doom (Arcade) can be played online with friends using Etera's P2P netplay. Create a room in the launcher and invite your friend, who joins through the invite. Step by step:

1. Download the Etera launcher for Windows or Linux and create your account.
2. Ask your friend to do the same and add them to your friends list.
3. Pick the game in the library and create a netplay room.
4. Invite your friend: they accept the invite and join the room.
5. The launcher keeps dependencies on the same version for both players, avoiding desync.

Download the Etera launcher (Windows or Linux), find Hero in the Castle of Doom in the Arcade library and click to download. The launcher handles the emulator and setup for you.

Etera uses a direct P2P connection between players, which usually means low latency. Results depend on each player's internet quality.

Yes. Every account gets a 5-day trial with premium features. After that, the free plan allows 3 new games per day and 1 netplay session per day. Premium raises those limits.