Outwitters is a turn based multiplayer strategy game that is free to play and includes in app purchases that range from $1.99 - $7.99 per item.
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Pro Asynchronous online multiplayer
Up to four player can compete in a match online, each taking turns asynchronously. This makes for a great way to causally play an online game as turns can be taken at leisure with no rush.
Pro Cross platform with iOS
Players can compete in matches cross platform with iOS users.
Pro Pass and play
Outwitters has a single device multiplayer mode where two users can pass around a single device taking each players turn in a multiplayer match.