F.03: Using N2O and Speedbreaker
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If you're familiar with previous NFS games, you've used nitrous before. A 
nitrous system provides a boost to your speed. You can give the N2O button 
a quick press or hold it for a sustained burst. You have a limited amount 
of nitrous, shown by the green, semi-circular meter underneath your main 
gauge. As you drive fast, the meter recharges.

Use quick bursts of nitrous to grab the road the straight yourself out of 
powerslides. You can also use a quick burst to push yourself into the next 
gear (when using automatic transmission). Use long, sustained boosts to 
speed through photo checkpoints or to keep your opponent at bay when 
approaching the finish line.

Speedbreaker is a new feature added to NFS:MW that puts you into slo-motion 
so you can drive more accurately. Speedbreaker is automatically available, 
and the amount of time you have is shown by the yellow, semi-circular meter 
above your main gauge. As you drive fast, the meter recharges.

Press the Speedbreaker key to enter slow-motion. A yellow meter appears in 
the center of the screen, showing the time remaining. Aim your car and then 
press the Speedbreaker key again to exit slow-motion. Use Speedbreaker to 
get around hairpin turns, to run roadblocks, dodge spike strips and evade 
Rhinos (police SUVs) during police pursuits.