Beast Wrestler is exactly what you'd expect: two overly-muscled mythological creatures beating each other up (and missing half of the time).
This bit of text signifying a "CES Version" is found with the title screen graphics. It was likely used for a demo version of the game shown at the Consumer Electronics Show.
At the title screen, press A + B + C + Start. Use Up and Down to select a song, and B to play it.