i want to know which season this episode of the golden girls was in. the episode is when they do a mystery like the game clue. who done it?

You'll probably have better luck with this question on the Golden Girls board ;) :)

I think the episode you are referring to is "The Case of the Libertine Belle".Its ep 156,in the 7th season,if thats the one you want.

Dorothy, Sophia and Rose join Blanche on a murder mystery weekend she has organized for the museum's annual outing. If the weekend is a success, Blanche hopes to impress Kendall Nesbitt, the museum's Director of Acquisitions, enough to be his hired as his assistant. Blanche would "kill" for this job, but Posey McGlinn, the other candidate, is her main competitor for the position. At the mystery dinner, no one is able to solve the mock murder. That is no one but Dorothy, who in a masterful sleuthing monologue solves the crime. All are impressed. After dinner, Blanche arranges for Kendall to drop by her room. Unfortunately, what was planned as a romantic rendezvous turns out to be a tragic one when Blanche finds Kendall lying on her bed murdered - with a knife in his chest...and guess who's the prime suspect. Blanche pleads her innocence to Dade County Police Lieutenant Alvarez, but after conducting a thorough investigation, he concludes that Blanche committed the murder. Dorothy comes to Blanche's aid and reprises her role as Sherlock Holmes. She establishes that in a fit of jealous rage, Posey killed Kendall over the assistant's job. Dorothy solves the case. But just as Alvarez book Posey, Kendall appears. It was yet another mock murder! Kendall thanks Blanche for making the museum's annual outing a success and assures her that she is still in the running for the job.

Hope that help ;)