Some iPhone games try to emulate the kind of layout you’d see on an actual video game controller — a directional pad on the left and a set of A/B/C buttons on the right. That’s a familiar configuration, it allows for a lot of options, and the developer can let the player customize just how everything’s laid out. In practice, though, the touchscreen control pads just don’t offer the level of detailed control you get from an actual dedicated controller, and detailed control is exactly what you need when playing that type of game.