Collect Chips from Kings

Collect Chips From Kings is the fifth story mission in Dead Rising 3: The Last Agent.

Summary
After Brad picks up the Pacifier, he will be able to successfully harvest the Zombrex chips from King Zombies. Cora needs a total of 20 chips to compare them all. King Zombies will be marked on the map when Brad enters a new district. Brad should be able to get the twenty required chips by finding King Zombies in Sunset Hills and Central City.

Although the game seems to recommend using the Pacifier to gather the chips, any method that kills the King Zombies is an option.