A clock, and every word you set buys some of it back.
How to play
Typeset's word puzzle, against the press clock. Solid green is a letter in the right place, an orange dot screen a letter in the word but somewhere else, flat grey a letter not in the word.
The clock starts at 1:30 on easy, 1:15 on normal and 1:00 on hard. Every word you solve adds the same few seconds: 22, 20 or 18. Solve faster than that and you gain time; slower, and the clock gains on you.
The run ends when the clock reaches zero, or when a word beats you in six tries. Most words wins.