Letterpeak

A word is worth its length × 100: 400 for the first, 1,000 for the last.

Buy a letter when you are stuck: it costs 100 of that word.

A wrong word also costs 100 and shows a letter. A typo that isn't a word costs nothing.

Each word has its own clock. When it runs out, the word is passed with 0.

Every word you solve swings the hammer. Solve all seven without help (4,900) and the bell rings.

LETTERPEAK