I like these quizes and would like to see more or variations but the Malaysian entries on this one make no sense to me, the largest figures i can find for georgetown is 300K and the smallest i can find for Johor Bahru is almost 500K (looking at City and Metro figures Mongabay/Wikipedia/Geonames). If it is indeed going by Urban Areas wouldn't having Kuala Lumpur and a couple of its suburbs or commuter cities be counting the same population group twice?
Kuala Lumpur, Klang, Kajang and Subang Jaya are all within the metropolitan area of Kuala Lumpur, and when separated, all others except Kuala Lumpur and Klang won't ever make it into the list in whatever criteria (population or area) or so. Ipoh, Johor Bahru and Shah Alam definitely deserve more than this.
Mind you, as others have said, I think the Malaysia ones are a bit questionable.
The largest cities are Kuala Lumpur, Johor Bahru, Petaling Jaya, Ipoh and Shah Alam. Update this please.