EXPLORATION is the second Level in BIT.TRIP CORE. The Background consists of a natural pit/canyon with a giant structure resembling a radar of sorts in the center, possibly a nod to Missile Command, the game on which the boss is based on. All of it is, strangely, exponentially more visible in BIT.TRIP Saga.
It comes after DISCOVERY and before CONTROL.
This Level is, while subtle enough to not notice it at first glance, ridiculously more difficult than DISCOVERY and tries to alienize the player, and everything that ever happens in EXPLORATION reflects this, from the cutscene to the strange background, to the weird trail and BEAT colours and to the depressing tune.
The music is a lot more intense, yet slower, and sadder than DISCOVERY, probably reflecting CommanderVideo's struggle to fit into the world he was born into, and thus to an interpretary extent the player trying to beat this Level.
If you manage to hit all the rainbow Beats, a strange distorted sound followed by low regular beep-like beats ending off with a progressively louder and higher-pitched sound resembling a car wheel driving will play, and move on to the next stage and the next part of the music. If you don't, you'll hear a progressively lower-pitched regular dampened beat accompanied by quiet percussion, then you'll play the next stage normally, but with the same music track as the previous one.