The Countryside is the first stage you unlock, and as a result costs nothing.
Countryside is mostly based on small hills and dips. It has jagged parts in the track that can stop most vehicles and is actually a challenging stage in the later sections. Vehicles like the Monster Truck, Tractor, Tank, Super Offroad and the Big finger excel on this map either because their large wheels negate most of the bumps or the treads get traction all over the ground. Vehicles like the Race Car and Dragster are not recommended because their front end can easily get caught on a steep hill.