C418 - Challenge Accepted.
An old track released by C418 on December 4th, 2011.
From the C418 wiki:
"Challenge Accepted. is an audio rip from a YouTube video Daniel submitted to a competition to become the composer for a game called "Gunpoint". It contains brief previews of multiple songs with gameplay and sound effects overlayed."
https://c418wiki.absolutelywhizzer.co.uk/i....