Think Liar Game and the numerous King's Game genre titles. They don't seem to have a consistent category recipe.

I remember one specifically that I can't find now. It had a group of childhood friends get kidnapped and placed in a room where one of them solves a puzzle so they advance to the next, and so on. And every time their loyalties to one another are tested. There was one scene that had something to do with a small white statue of a cat (maybe) and some coins, and maybe something about the coin's weight vs weight of loyalty or something like that.

I think there was hinting that the whole thing had started cause one of the friends was really deep in debt.

Fire away!

Tomodachi Game comes to mind immediately re: friends kidnapped and forced to play a game because one of them is supposedly deep in debt, but I don't remember the specific game you're talking about, so this might not be the manga that you're thinking of.

Other survival games:
Battle in 5 Seconds After Meeting
Btooom!
Darwin's Game
Jinrou Game and sequels
Rengoku Deadroll
Torikago no Tsugai
Zero Game