The indie roguelike Mysterious Castle may look simple at first, but beneath the minimalistic iPhone-adapted UI lies a surprisingly tactical party-based/turn-based RPG built with SRD 3.5 (i.e. a loosely Dungeons & Dragons-derived roleplaying ruleset) as the foundation and inspired by games like Temple of Elemental Evil, Tactics Ogre and Zangband. The roguelike part of MC is that the world is randomly generated, but unlike most roguelikes this is a party-based game in which the player controls up to the three characters at the same time. The combat gets complex and challenging really fast, and the often large-scale battles include things like enemy mages, AoE spells, summoned creatures and a mix of melee and long-range weapons with multiple attack options (such as snipe, rapid shots, flurry, spin attack etc.) as well as positional modifiers such as flanking and high ground.

At least for now, Mysterious Castle is first and foremost a Mac and iOS game for the mundane reason that the Hong Kong-based developer apparently doesn't own a copy of Windows. He would like to get the game properly ported in the future, though, but sales of the iOS version (as well as Paypal donations) will determine whether that will be possible or not. Planned features to be implemented in the future includes a much larger party of playable characters (presumably the SRPG inspiration has something to do with that), destructible environments and eventually even online play (!).

Official website:

http://www.mysteriouscastle.com/

indieDB project page:

http://www.indiedb.com/games/mysterious-castle

Developer's YouTube channel:

http://www.youtube.com/user/jjurksztowicz

Official trailer:

http://www.youtube.com/watch?v=c9gtLQGnjNg

The manual (good for getting an overview of the gameplay features):

http://www.mysteriouscastle.com/playerguide#quickinstructions