Two robots are traveling through the space, but their spaceship suddenly runs out of energy. Now, they need to Reach The Core for the energy, so that both can continue the journey.
There's a planet with the plasma nearby; the problem is that its location is right in the core of the Earth. Ask the robots to hop in a driller and start mining resources – this is the only way to harvest a significant plasma supply. Drill the core from left or right and collect an amount of minerals that help buying upgrades and unlocking new drill equipment in Shop. Keep on upgrading, since it's impossible to reach the core on your very first attempts. Activate the "rocket turbo" to dig faster, more powerful, and more efficient. Be aware of the creatures that lurk underground.
How good you are at mining stuff underground? Want to Reach The Core? Start the engine and dig hard!