This is a tool-assisted speedrun. For more information, see http://tasvideos.org/3531M.html. TAS originally published on 2017-10-15.
The GBA version of Kao the Kangaroo, unlike the Windows and Dreamcast versions (which are action-adventure games), is a 2D side scrolling platform game. Kao is a young kangaroo living with his family in the jungle when, one day, they are captured by a ruthless hunter and his goons. It's up to Kao to drive the invaders from his home and save his family.
TASeditor (http://tasvideos.org/Taseditor.html) blazes through the game in record time.