Based on the recent release of the Colossal Cave Adventure source code, here's my build of the game for PowerPC. Just double click on Adventure.command to open it up in Terminal.
SHA1 = ae10f0b12df16e03b3e1464fbef2dedf12184e69

SHA1 = ae10f0b12df16e03b3e1464fbef2dedf12184e69