It takes quite a bit to stand out from the pack of marble rolling games for the iPhone, but with an interesting atmosphere and art style along with challenging timed puzzle elements, Marbles Multiball 3D - The Castle Adventure [App Store] is different enough that it's worth a look.
Much like many other marble rolling games, Marbles Multiball 3D is controlled using the accelerometer and if you've played one before you'll instantly be familiar with how the game works. While many of these games have 2.5D graphical effects that coincide with how you're tilting your phone, Marbles Multiball 3D has a more dramatic effect than most because of how deep most of the levels appear. (Instead of say, Labyrinth 2 where the levels only appear to be as tall as the ball itself.)
The menus are filled with ancient looking statues, broken skulls, and other spooky graphical elements that set the mood of the game. The levels themselves are made out of stone and tile, and often times are either framed in lava or a black abyss. The 42 included challenges start by simply rolling a marble from its starting location to a round indentation on the other side of the level.
It doesn't take long before you're dealing with multiple marbles of different colors that all need to end up in their matching indentations at the end of the level along with mazes that have no walls, jumps, blocks that need to be pushed out of the way, and other obstacles.
The developers posted this trailer which shows a few of these different levels along with some multi-ball mayhem:
Three difficulty levels are included which change the amount of time you have to complete each level, and the "master" difficulty is downright insane. The only thing I don't like about Marbles Multiball 3D is the omission of an accelerometer calibration option, so the game can only be played by holding your device completely flat. Regardless, it's one of the more interesting marble rollers available and is worth checking out if you're a fan of these types of games.
App Store Link: Marbles Multiball 3D - The Castle Adventure, $1.99