I really like Riot Zone and one of the reasons I joined the site years ago before I started seriously posting was to follow up on the TZD stock thread or whatever to re-buy it. Of course the info was outdated at that time and I missed out.
I think the music is especially amazing in that game. It's this weird proto-jazz-fusion-rock stuff that could have only come from Japan in the 90's. In particular I love the boss music (I can't remember if there is different boss music right now, if so I am talking about the level 1 boss) and the name entry screen.
One thing that always irked me though was Tony (Was that the red guy? or was it Hawk?) had the most embarrassing walk cycle that looked like some kind of weird reverse-moonwalk march for lack of a better description. But overall I would love to get another copy one day. Still have the music ripped on my HDD from years ago.
Missed out on Theron's Quest from that thread also, another game I used to have.