Coins are the primary currency in the game, and they can be earned by selling cars, upgrading your facilities, and completing challenges. Gold and diamonds, on the other hand, are the premium currencies, which can be used to unlock premium features, accelerate tasks, and access unique items. You can earn gold and diamonds by completing special offers and quests or by purchasing them with real money.

Facility Upgrades
Upgrading facilities in Car Industry Tycoon: Idle Sim is one of the vital features of the game. Once you've built your car factory, you can upgrade it to improve production efficiency, worker satisfaction, and expand your company. Upgrading facilities requires coins, which can be earned by selling cars, completing quests, and by upgrading other factories. There are six categories of facilities; Assembly, Paint, Inventory, Engine, Research, and Marketing.

Assembly Facility is critical for assembling and building cars. This facility allows you to add extra production lines, and increase production speed, by upgrading with better tools and more advanced machinery.

Paint Facility controls the output of the paint and the bodywork of cars. Upgrading paint facilities increases the quality of the cars' paintings and bodywork, thus boosting the car's resale value. You can unlock new paint colors and designs as you advance in the game.

Inventory Facility stores the spare parts and components needed for assembling cars. Upgrading this facility increases storage capacity, and let you expand your inventory.

Engine Facility produces engines used for all your car models. Upgrading boosts the engine production rate and capacity.

Research Facility allows you to research and develop new car models, design enhancements, and engine technologies. Upgrading this facility adds more researchers and unlocks new technologies.

Marketing Facility promotes your cars, organizes trade shows, increases the number of dealerships, and helps in selling cars. Upgrading this facility boosts your sale marketing strategies and expands your customer base.

Car Production
Car production is the most important feature in Car Industry Tycoon: Idle Sim. To produce cars, you need to assemble the parts and start production. The game features various car models with different specifications, and each car takes a specific time to assemble. You can manufacture multiple cars concurrently by upgrading your facilities and adding more assembly lines.

Upgrading your car supply chain unlocks a new range of car models and designs, which requires different parts and are sold in different market segments, thus generating more profits. The game features shifting consumer trends, and if you don't keep up with the market demands, you may end up with excess stock and financial losses.

Selling Cars
Once you've produced cars, you need to sell them to generate profits. The game has a global market where you can sell your cars in different countries and regions. You need to identify the market demand for specific models and produce them accordingly. As you gain more customers, you'll need to build more dealerships, advertise your cars, and provide customer support services. The game has a comprehensive customer feedback system that provides suggestions on how to improve your cars' performance and customer loyalty.

Conclusion
Car Industry Tycoon: Idle Sim is one of the best simulation games in the market. It offers a beautiful gaming environment and thoroughly-explained gameplay mechanics. By following this walkthrough, you can easily understand how to navigate through the game and become a successful car industry tycoon. Have fun, and Good Luck!