It’s a game version of what you imagined the little Lego vehicles you pretended to create did in your imagination as a kid. It’s pretty fun, kinda grindy in campaign mode, but at least worth an afternoon if you like any other vehicle building pseudo engineering game.

And yes there is multiplayer, including multi-single player where other people’s vehicles invade your world. It’s balanced enough that you shouldn’t usually get curb stomped by them.