I like the nostalgic game angle, Joseph Duke.

I think the second part of the logline is vague (The subsequent sequence of events threatens their very existence and introduces a nostalgic game that threatens to 'kill again').

This isn't a full logline, but it's a start: "After the son of a billionaire invites his old college classmates to a remote getaway party, they play a nostalgic game that makes them relive their wildest experiences _____________."

I'm trying to figure out the end of the logline. What's the protagonist's goal in the story?

one of them is out to unravel a covered up murder of another student

you need to write the goal of the hero of the story.

a friend of a millionaire gets to a party with a game and investigates the death of a man during the last party. suspecting that one of his friends is the killer.

Arthur this sure bring it from a different angle... i love it. Hope you dont mind if i copy and twick. Thanks a million

Joseph Duke, Sure. We help each other to make our loglines better.

Log line

A millionaire's friend attends a getaway party at a remote beach villa with nostalgic games and a plot to investigates the death a lady during the last party, suspecting that one of his friends is the murderer.

I like the new logline, Joseph Duke. One tiny suggestion: Change "the death a lady" to "the death of a lady."