In Hill Climb Racing, players can unlock various vehicles such as trucks, motorcycles, and even a tank. Each vehicle has unique characteristics, like speed and suspension, affecting gameplay and terrain performance.

Coins are earned by completing levels, performing stunts, and collecting coins scattered on the track. You can also earn bonuses for distance and flips performed during races.

To upgrade your vehicle, go to the upgrade menu after selecting your vehicle. You can enhance attributes like engine, suspension, tires, and more using the coins you’ve collected in the game.

To improve performance, focus on upgrading your vehicle, mastering controls, and learning the terrain. Experiment with speed and acceleration, and use flips strategically to maximize coin collection during runs.

Unlocking new tracks and vehicles involves progressing in the game. As you complete races, you will gain experience points (XP) which help level up. With each level up, you can access new tracks and unlock additional vehicles.
Steps:
1. Complete races in your current level.
2. Accumulate experience points (XP).
3. Level up to unlock new tracks.
4. Collect a certain number of coins to unlock new vehicles.