The target of 90 Seconds is to guess as many words from the given topic as possible... but there is a catch: the words must start with the specified letter.
The more words you type, the more points you earn: if your word is valid, you will earn up to 3 points (depending on how common the word is, its length, and difficulty).
But be careful: if you skip a word or leave it empty, then you will lose points.
Enjoy!