This is a tool-assisted speedrun. For more information, see http://tasvideos.org/2354M.html
Croc 2 is the sequel to the successful Croc: Legend of the Gobbos (http://tasvideos.org/1744M.html) .
As expected, the Game Boy Color "port" doesn't play much like the PlayStation or PC versions, but it does provide some interesting gameplay. Look out for the large shortcuts made possible by breaking the game's physics engine.