I found myself trying to drag the vertical bars initially. It took awhile to discover that I could simply click the letter to select it. Unfortunately I am tutorial averse.
replies(1):
After having pressed "learn to play" I got to the bit "Give it a try and form the word E N D" but the UI was frozen . I then selected "Exit how to play" but that left the URL unchanged so I was sent back to the start of the tour.
This is on Firefox on Windows.
What dictionary are you using? I tried a couple of words like 'acing' and 'awing' that should work?
On the words: Word Slicer focuses on base or dictionary forms. The list includes common nouns (like river), verbs (like dance), and adjectives (like bright). You’ll find wide but not wider, for example — which is why words like acing or awing don’t register.