One of the best elements in Deus Ex atmosphere and gameplay is level design. Being able to pass through the ventilation systems, through the sewer, over the rooftops, swimming under the city and finding other alternative paths. Because of it, you are limited only by your play style, there are no better and worse solutions. Deus Ex responds on how you want to play it and it encourages you to find your way of solving the problem. That makes it one of the most intelligent games ever made. So, what can be used in Alpha Protocol? Complex level design with multiple paths and attention to details. Non-linear skill based action gameplay which responds to your play style. Many gadgets and weapon customizations. Non-linear story, good dialogue system and story telling.