Euro Truck Simulator 2

Euro Truck Simulator 2 is a trucking simulator from Czech studio SCS Software. It first came out in 2012 and is still being updated. You haul important cargo across Europe, visiting dozens of cities based on real places.

You start by renting a truck and taking jobs, then buy your own rig, level up skills, open garages and hire other drivers. What matters is care, not speed: following traffic rules, managing fuel and rest, and delivering cargo undamaged. There is a Steam Workshop full of mods, and plenty of add-ons for maps and trucks.

The game has no real ending, but HowLongToBeat puts the main line at about 46 hours and a 100% run at about 458. At roughly 2 hours a day (about 60 hours), a month is enough to grow a business and cover most of the map. The single-player game works fine offline; multiplayer is not part of the rental.