The premise of these games in Roblox is that you jump in an elevator with a chance of getting some in-game currency, but it's usually something scary (a Slender , a Piggy, some Zombies). It's played with a bunch of other players.
Murder Mystery 2 is a very popular Roblox game that is suitable for most ages. It's a classic game of Cluedo, or Among Us, reimagined in Roblox. There is one murder per round, a group of innocents trying to figure out who did it, and a Sheriff who can help out.
Breaking Point was originally banned on Roblox but is currently one of the most popular games on the platform. It's a sort of murder mystery type game where players take it in turns to take down everyone else.
Despite its blocky quirkiness, the world of Roblox is inhabited by several spooky horror games. While the majority of them are still family-friendly and suitable for all ages, there are a few that are quite unsettling and intense.