Parallel Kingdom is a location based MMORPG that is free to play and includes in app purchases that range from $2.99 - $114.99 per item.
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Pros
Pro Pets can help explore areas the player can not reach
Usually AR games require the player to leave their house in order to really play the game and advance, luckily Parallel Kingdom gives the player a pet dog that can go out and explore even when the player never leaves their house.
Pro Numerous different character classes to choose from for play
Being that the game has been around for so long there is a ton of content including 14 different playable classes. This is great for replayability as well as a great way to expand the type of tactics used in game.
Cons
Con Pay to win
After having spent a few hours in game the balance of food earned does not match what is required to level up at a worthwhile pace. The game is unfairly balanced in order to force the player to spend real world money on a secondary currency. So those that have funds to waste on the game will advance quickly while those that do not will be left to pretty much languish.