Manic Digger is a Minecraft clone.

If for some reason you don't want to install the OpenAL files with oailnst.exe, you can do the following:

1. Go to OpenAL Soft.
2. Download the openal-soft-x.xx-bin.zip (where x.xx is the version number).
3. From the Win32 directory in the archive, extract soft_oal.dll to the ManicDigger directory.
4. Rename soft_oal.dll to OpenAL32.dll
5. Start the game and enjoy.