Idea: you have a "platform" that moves from one location to another. When the platform moves, any characters standing on the platform will move with it.
The basic platform is one where you trigger an action and the platform then moves in a fixed route to another position. Probably doesn't get any simpler than that as a mechanic.
More advanced platforms involve things like
automatic moving platforms - requires timing on the player's part to get on and get off platforms
variable sized platforms - instead of a single tile, it could cover multiple tiles
variable shaped platforms - instead of a rectangle, you have all sorts of shapes
tileset graphic platforms - the platform itself looks like something you could probably put together using the map editor
player-controlled platforms - this can be pretty much considered as a vehicle
Idea: you have a "platform" that moves from one location to another. When the platform moves, any characters standing on the platform will move with it.
The basic platform is one where you trigger an action and the platform then moves in a fixed route to another position. Probably doesn't get any simpler than that as a mechanic.
More advanced platforms involve things like