Navigate through clues using arrows in the bottom of the screen.
After touching any number on the screen word description appears at the bottom of the screen and the description is read aloud.
If you can not hear the description go to Settings/Language and Input/Text-to-speech. There you can either install any text-to-speech engine or change its settings (under Preferred TTS engine touch icon) by installing more voices (say male voice instead of default female) and adding new languages.
Then touch the first letter placeholder near the number. On screen keyboard will appear. There you can start typing a word. Note that if some letters are already on the screen (i.e., from the other words) you do not need to type them twice.
As soon as crossword is filled press the button at the right bottom corner of the screen. The correct words are highlighted in blue while the errors are highlighted in red. You can correct errors and press the button again to check if your input is correct. Given that there are no empty spaces in crossword and there is at least one correct answer the time spent per correct answer is put into Google Play Games powered leader board.
≡ menu at left top corner allows to start new game, check correctness of input, save game, load game, select crossword size, select language of crossword, select hardness of crossword, and either turn on or turn off hint.
Hint appears in the word description allowing you to solve most difficult words.
⁝ menu at the right top of the screen allows to start the new game, check correctness of input, select size of crossword, select language of crossword, and select difficulty of crossword.