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This design is controversial, as by its nature it generally prevents the use of all of its features with the player's hands in any one position the D-pad, L-shoulder, analog stick and Z-trigger cannot, generally, all be used at the same time as it typically requires the player to switch hand positions, taking the hands off of the key directional controls. Very few games use the directional pad exclusively, such as Tetrisphere and Kirby 64: The Crystal Shards. In some games such as Mortal Kombat Trilogy, the control stick and directional pad are interchangeable. This setup allows dual-analog control on some first-person shooters such as Perfect Dark. Additionally, though the controller was not designed with this setup in mind, one controller can be held in each hand with a thumb on each analog stick and index fingers on the Z trigger. Finally, the controller can be held by the center and left-hand grip, allowing for a combination of the D-pad, L shoulder, analog stick, and Z trigger, as was implemented in GoldenEye 007. It can be also held by the center and right-hand grip, allowing the use of the single control stick, the right hand-buttons, the "R" shoulder button, and the Z trigger on the rear (but not the "L" shoulder button or D-pad). This style was intended to optimize play in 2D games by emulating the setup on the Super NES controller. First, it can be held by the two outer grips, allowing use of the D-pad, right-hand face buttons and the "L" and "R" shoulder buttons (but not the Z trigger or analog stick). The controller was designed to be held in three different positions. They're the buttons that get high traffic." : 12 That's why the A and B Buttons are placed for easiest access on the new controller and why they are larger than the other buttons. Nintendo of America's head designer, Lance Barr, said that the design studies revealed that "most games use a few buttons for most of the main controls, such as jumping and shooting, or accelerating and braking. During development, the first mock-up was created out of clay. The sculpted shape of the radical new Batarang-like controller was so complex that it couldn't even be modeled on a computer. Lance Barr, the head designer at NOA, worked with the NU64 design team in Japan on the controller.
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