Car Merge Master

As a casual puzzle merging game, we use the car as a carrier to improve the playability of the game by continuously merging and upgrading the car.
1. Make as many cars as possible, don't merge them to only one car
2. Make the car level as high as possible. By combining two low-level cars, a high-level car can be obtained.
3. Do your best to complete the task, because the task will have a lot of gold rewards
4. Formulate your merging strategy to maximize the benefits. You can't merge none of them, and you can't merge all the time. I believe you will find a shortcut if you are smart.
5. If you don't have enough gold coins, then go for the challenge. If you win, you will get a lot of gold coins, and there will be free gold coins as gifts.