Nitros allow you to skip a word in the text. The best time to use nitros is on long or extra hard words. To activate a nitro press the enter key. Unfortunately you can’t buy nitros anymore now the only way to get nitros is by winning races and claiming your mystery box. If your nitros are locked getting your average speed higher will unlock your locked nitros. You get nitro achievements for using a certain amount of nitros since you can’t buy nitros anymore most racers usually have less nitros so now the nitro achievements are easier to get than they used to be when you could still buy nitros.