Rovio just released Angry Birds Seasons ‘Go Green, Get Lucky,’ the St. Patrick’s Day add-on to the popular seasonal game. The update is free for Android as usual and can be downloaded now from the Android Market. The iPhone variant costs 99 cents. The add-on brings St. Paddy’s Day themed levels, character designs and music, so be sure to check it out while you’re chugging down that green beer on March 17. Video demo of the Android version after the break.