From the start, Left and Right Inc.
In each area, new drilling mechanics are introduced, powered by a new underground substance: magma.
There are also new people, like Philip, who runs a shady card game in the saloon. No more expensive upgrades needed, high oil prices for everyone! Instead of dealing in diamonds, he has his own store where you can sell and buy all sorts of underground treasures. That's why we've lowered the entry level for using gas.