Geolocation games (also known as location-based games) are mobile games that incorporate changes in the player's real-world location into the gameplay. The most famous example is Pokemon Go, but there are other geolocation games out there too. Mythwalker is one such title from NantGames. It allows up to three players to team up to battle monsters and complete quests together, even if they're not located in the same area.
Here's the official description of the game:
MythWalker is a geolocation fantasy role-playing game for iOS and Android devices. Players can take part in exploring combat, magic, crafting, resource minigames and more. They can venture out in the real world to interact with the game, or continue their adventures from the comforts of home with Navigators using Portal Energy. MythWalker takes players to Mytherra, a fantastic parallel world to Earth, where they are recruited by a powerful being, known only as The Child, to investigate attacks on her world. She guides players on mystical quests and adventures to uncover the truth about the attackers, explores the connection and shared histories between Earth and Mytherra, and leads the heroes in defending their home.
As for the new co-op feature, it works via a feature called "tethering." Here's NantGames' description:
Tethering is a new groundbreaking feature that allows players global synchronous gameplay for up to three players. Up to two players can join a lead friend to explore the leader’s local landscape together. For example, a player in New York and another in Tokyo can tether to a lead friend in London, and together they can explore the streets of London as a party. Together they can complete story quests, battle enemies and gather resources. The more players in a party the better rewards.
Co-op certainly sounds like it adds a lot to the game; we'll have to try it out so that we can provide some firsthand impressions. The co-op feature is part of a major update that adds lots of new content to Mythwalker, including trickster "Wyldvae" enemies, a quest set in Stonehenge, a hobgoblin ally for certain quests, new storylines, and more.
Mythwalker is free to play on Android and iOS. Visit Mythwalker.com for more information.