I like chaosprime's minor wording change best out of all the options so far.
As for suggestions of adding more types of options to the options - remember, this has to be something that someone searching for a mud will search for. If I'm looking for a mud, I'm not going to spend 15 minutes trying to decide which of the 150 different click boxes I need to check off. As a player, here's my personal list of things I'm looking for:
RPI
ONLY voluntary Donations accepted as any monetary exchange, and with no in-game returns at all, of any kind.
English language
and - if filters were added, I would filter out mushes so they didn't show up on the list.
Then - once I had the list of whatever shows up, I'd be able to check each game with a name that sounds intriguing to me, for all the OTHER criteria I'd look for in a game - such as a stable server, a game that's been around awhile and is "gold" (not in testing phase), a fully-functioning website complete with game documentation and helpfiles, and I'd also see to make sure the game is basic telnet-compatible and doesn't require a browser to access, and doesn't force colors as a default, and allows the player to use their own color scheme - or none at all if they prefer.
But I wouldn't look for all that stuff in a search engine. I'd only look to see if it's free, if it's an RPI, and if it's in English. If I could choose the "type" of free, the only "type" I'd need to know about, is if it allows people to donate, but doesn't give anything in-game in return for the donation. If it has a cafe-press link, I'll find it AFTER I've determined that I don't have to pay for anything AND I don't have to compete with people who do pay something. The four options are just enough - not too few, not too many, to keep my interest.
Not unlike all my clear, concise, brief (heh) , and perfectly proportioned posts.
