Perform a 180 degree Flatspin

Flatspin，字面意思水平旋转，也就是车头方向与行进方向发现偏离；该奖杯要求至少达到180度。

完成方法来说，可以选择一个冲坡，加速冲击，在飞起之前按下 □ 并打方向盘。
为了在滞空时间内完成旋转，比较简单是找一个有落差的冲坡，例如西部山区，或者是停车场楼顶的位置。

复制下psnp看到的tips
To do a flat spin, you will need to use the Emergency Brake (Square) while driving. The best tip is to go to an area where you can drop down below from a very high height. Once you're at an area that fits the requirement, press Square right before going off the ramp to start your flat spin. Keep in mind that you cannot crash for your flat spin to count. Once you begin flat-spinning, you can track the total degree of spin on the bottom-left hand corner of the screen. Below is a visual reference if needed.