In Reach The Core you need to get to the core of the planet. To do this, you have a special machine that can drill into the ground and sink into it. You need to dodge stones, which reduce the time of diving the car, collect bonuses and various minerals that can be sold. Over time, you can change the car to a more powerful one and add special modules to it. Maybe I didn’t quite understand how to play correctly, but when buying upgrades I didn’t really notice any progress in the game.