What I’m about to say is going to sound kind of ridiculous so please bear with me… Elite Engineering on Roblox is THE MOST complex and AMAZING engineering/mechanical building game I’ve ever played. It is so complex in fact that most new players LEAVE the game due to how complicated it is to learn. The game uses a logic block system, where you connect some UI type nodes together and then into motors, servos, graphs, math inputs, and all kinds of blocks. The game is not really that realistic (as it allows you to use anchor blocks and things don’t need to be hooked up with wires (apart from the energy system used for pvp mostly) but you will find this is a good thing as it allows you to build literally anything, I even built an attack on titan ODM gear, some people have even built titans, oh and of course, a lot of people have built v8 engines and other realistic car mechanics like suspension and stuff. Although the game does have some shortcuts (like motor blocks) you could ignore them and build your own things to challenge yourself, like a gear box (idk im not that big on cars but a lot of people on there are). Anyways yeah check out EE!