The Main Screen shows the City map. Most of the buildings on the map are entrances to game locations and mini-games. You can see ribbons with their names above them. Locked locations are marked with a padlock image.
You can spend coins to unlock locations after reaching a certain XP level.
If you have only one XP level left before the location becomes available, you can unlock it for rubies.
Unlocked locations are marked with a game mode or anomaly icon. If a a friend has charged a location, a hands image will appear above it.