The Moon stage is the seventh stage in Hill Climb Racing, and costs 175,000 coins to buy. Early in the game, it is the best stage by far for earning coins, due to its low gravity, which makes performing flips and achieving air time easier. It has the lowest gravity of any stage, but it is not always a convenience.
Its actual landscape is a combination of Arctic and Countryside, with steep hills and jagged outcrops, but it is rarely seen because of the amount of air time that can be achieved. While flying in the air, however, it is easy to miss fuel cans and will likely be the reason most people die. Any vehicle can work on this map, but the Quad Bike and Monster Truck are amazing when it comes to flips because of their powerful engine and four wheel drive.
You can use the Moon Lander to fly up using the low gravity and use the air time to make quick money (around 20k per run). You can also get $1000 by going backwards at the start until you hit the invisible barrier, you will then flip, earning you some money.
It is also beneficial to upgrade your Mid-Air Control on Moon so you can get more flips. The most annoying part to get up for beginners is around 483 meters, as there is a steep hill. Upgrading your engine and your wheels can help avoid this problem.