Game-scenarios adds mini-games, scenarios and events to ATS & ETS2. Some are free, some are paid. The add-ons will never be more then €2,- so even players with limited means can enjoy these little expansions. For now more ATS and maybe ETS2 scenarios are planned for 2021. Eventually you decide with your support, how soon they can be released and if more scenarios will be added in the future.
All add-on scenarios are best used in combination with ATS real companies, billboards & shops mod, which can be found in the Steam workshop.
In general all official DLC’s for American Truck simulator are required to use the add-on scenarios, unless described otherwise.