I'm planning a trip to Mérida to visit the Roman archaeological sites. Please outline what sites are covered by the 'Entire Set' ticket, their general operating hours, and any specific closure dates. Also, advise on the best ways to get around the city to see these sites and if there's an official mobile app to assist with navigation.
Navigate to 'turismomerida.org'. From the 'Plan Your Visit' menu, click on 'Fees and Hours' to identify sites included with the 'Entire Set' ticket, their seasonal operating hours, and closure dates. From the 'Practical Guide' menu, click on 'Moving About' to understand transportation options within the city. From the 'Practical Guide' menu, click on 'Mérida Guide App' to check for a mobile application and its purpose. Synthesize all gathered information on included sites, operating hours, transportation, and app details.
List the Roman sites accessible with the 'Entire Set' ticket: Roman Theatre and Amphitheatre, Roman Circus, Alcazaba (Arab Citadel), Morería Archaeological Site, Crypt of the Basilica of Santa Eulalia, and House of Mithraeum and Columbarium. State the general opening hours for April 1 to September 30 (9:00 AM to 9:00 PM, with Morería as an exception: 9:00 AM - 3:00 PM and 4:00 PM - 6:00 PM). State the general opening hours for October 1 to March 31 (9:00 AM to 6:30 PM, with Morería as an exception: 9:00 AM to 3:00 PM and 4:00 PM - 6:00 PM). Mention that sites are closed on December 24, 25, and 31, as well as January 1. Describe both walking (due to level topography and pedestrian streets) and public transport as recommended methods for moving about the city. Confirm the availability of the 'Visⓘt Mérida' official app and explain its purpose: to make visits more comfortable, provide information on tourist interest points, events, contact info, digital content, and guide tours.