Angry Birds (video game) crates and rocks are incorporated into the structures, and power-ups may be used to enhance the birds to attack hard-to-reach pigs. Also in the levels, players can unlock bonus levels by collecting golden eggs. There are several different types of birds used in the game, distinguished by their color and shape. In the earliest levels only the basic red bird is available. As the player advances through the game additional types of birds become available. Some birds are effective against particular materials, and some have special abilities that may be activated by the player while the bird is airborne. For
Angry Birds (video game) of its spin-off games, "Angry Birds Seasons" and "Angry Birds Rio" to the PlayStation 3, Xbox 360 and Nintendo 3DS systems. Bundled together as "Angry Birds Trilogy", the games were built specifically for their respective consoles, taking advantage of their unique features, such as support for PlayStation Move, Kinect, high-definition displays and glasses-free 3D visuals. "Trilogy" was also ported to the Wii and Wii U almost a year later. A motion controlled version of the game has also been released as a Samsung Smart TV App. Reviews for "Angry Birds" have been mostly acclaimed by critics. Chris Holt of "Macworld"