It's weird to me this game ever left the zeitgeist with how unique it's mechanic is - put in any CD and it will generate a monster for you!
How is that not awesome??
Also, as unholy as it feels, the CD doesn't have to be a music CD... 馃槈
Me holding the longbox for Ecco the Dolphin for Sega CD with the disk clearly inside of my PS1.
Me holding my Monster Rancher Jewel Case up against the title screen on my TV