Reference article
Final challenge
Directly control your duck in the final race against the Fire Duck.
Unlocking
Beat all three key opponents in the 
Volcano. Open the locked box and trigger the volcano event to confront the 
Fire Duck. This edition does not impose the Flash requirement of level 150 in every stat.
Controls
Use left/right to move and jump to clear hazards. Use Left/Right arrows and Up or Space to jump, alongside mobile directional and jump controls. Avoid lava and keep moving through the course.
Victory
the postgame rewards: 
Golden Crown, improved trainers with a level-250 cap and the 
Arcade.