sayeth the Enigmo 2 info page:
These are the game's minimum system requirements:
• 800mhz G4 or any Intel Mac. Will NOT run on older Macs with a G3 processor.
• 256MB RAM and 32MB VRAM
• Mac OS 10.3.9 or later.
• QuickTime 7
(note to Pangea: real unordered lists aren't that hard. really. try them sometime. [look at the source for the page if you don't know what I'm talking about.])
but this list is inaccurate.
I ran the demo just fine on my 450 MHz G4 Cube with 1 GB RAM and a Rage 128 with 16 MB VRAM. of course, I had it at 640x480 in a window at “low” quality, but it ran well in this configuration. so, don't always believe the requirements.
incidentally, iirc, the original Enigmo was the same way.