Unlock all the pairs of letters at the bottom of the screen by finding words that end with those pairs. They can be unlocked in any order.
You find words by adding them to the end of the chain.
At the top of the page is the start of a chain of words.
You can add a word to the chain if the start of the new word overlaps with the end of the last word in the chain by 2 or more.
For example, if the last word was "education", you could follow it with "onset", "ionic" or "educational".
If that all sounds complicated, don't worry, it's easier than it sounds. You'll get the hang of it fast.
You gain points for unlocking pairs but lose them for using the undo button and for each word you add that doesn't unlock a new pair.
There are also points available for using the minimum possible number of words or unlocking the endings in the order they appear at the bottom of the screen.