A normal Blu-ray player cannot play 4K Ultra HD DVDs. This is because 4K Ultra HD DVDs require a new type of player that is specifically designed to handle the higher resolution and greater storage capacity of the discs. While some 4K Ultra HD DVDs come with a standard Blu-ray disc as well, these discs will not provide the full 4K Ultra HD experience. In order to play 4K Ultra HD DVDs, you will need to purchase an Ultra HD Blu-ray player, which is capable of playing both standard Blu-ray discs and 4K Ultra HD discs. Additionally, you will need a 4K Ultra HD TV in order to fully enjoy the increased resolution and picture quality of the discs.