Bsically a game where it's like GTA V except the entire map is the entire north american continent, fully to scale, as in driving from one side to another (new york to LA) would take 2-3 days IRL if you non-stop drove. Except instead of GTA V, you can do whatever the forget you want. Every single car ever made would be in the game, same for airplanes, heli's, boats, trains, EVERYTHING. Every building would have an interior and indoors. You can buy any house or property in the game, like in real life. You can work like a normal person or go GTA style and blow stuff up in missions to get money. Anything and everything would be destructible, if you dropped a nuke in a town, everything would be demolished realistically. Crashing cars into buildings, you would go right into the buildings. You would be able to create your own character when you first make a save-file or play the game first time. Like how the sims would work in the character customization. You could buy any type of clothing you want. Every single weapon that has been made IRL would be avaible in this game as well. Things would have the same price as they do IRL. The game would have a massive stuff-load of cheatcodes to do whatever. There would be fast-travel when in map mode as well if the player so wished.
Basically a life simulator, but 9999 times better than GTA V in every way imaginable, huge map, everything.
Also it would have virtually no lag. 60fps no matter what system you play it on. Available on every single console or system, no lag whatsoever. The game would only cost about 40-60 dollars. The settings would have all of the essentials, Minimap, gui, graphical settings, screen settings and aspect ratio, gameplay, controls, etc etc etc.