Like everyone else with software to sell, top-tier game developers are flocking to the iPhone, and gamers are reaping big rewards.

就像其他所有经营软件者一样，顶级游戏开发商蜂拥向iPhone，而玩家们也正收获着巨大的奖励。

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Sizing of this tier depends almost entirely on the implementation of the game engine.

这一层的规模几乎完全取决于游戏引擎的实现。

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This is the tier where the game engine -- the heart of the simulation -- resides.

这一层是放置游戏引擎的地方。

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And the fact that top-tier racing game players have proved their mettle in actual race cars when given proper training implies that there are many useful skills that transfer from the virtual world to the real one.

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With Pools gearing up for their second season in the third tier of the game, Butterworth feels the extra challenge of playing at stadiums such as Elland Road and the Walkers Stadium will be an incentive for the players.

BBC: Ian Butterworth

This adds another tier of difficulty to the game, as you have to carefully manage each fighter's life bar.

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