My son is obsessed with Roblox and we often play co-op together. It's a neat thing and now he's learning how to create content which means learning how to use an editing system and some light scripting.
There is no one game - it's thousands of games designed in Roblox Studio. It's a flexible tool and games can be just about anything. My son loves Flood Escape 2 which is a coop platform game in which you need to stay ahead of the flood while making your way to an exit.Is there a video that explains generally what you do in that game?