Workers install a giant slingshot which is a part of the "Angry Birds" game at the Angry Birds Land built in Sarkanniemi Adventure Park, Tampere, Finland, April 25, 2012. The Angry Birds Land in Sarkanniemi Adventure Park began to be built in the winter of 2011 and will be open to the public on April 28, 2012. The "Angry Birds" game developed by the Finnish game company Rovio for touch screen smart phones has quickly become popular around the world with a great success since it was launched at the end of 2009. [Xinhua]