Solution checking and revealing 

• Clicking on Check (icon at the bottom left corner) will check all letters and mark the incorrect ones only. It will not reveal any answers.
  Note: Subsequent reediting of cells marked as incorrect will have a black mark in the top right corner to remind you that it was checked earlier.
• Clicking on Reveal (icon at the bottom left corner) will reveal a single letter, a word or the complete solution. Use the selection box below the icon to specify whether you wish to reveal a letter, a word or the entire solution.
  Note: The command will mark the incorrect ones or unfilled squares with a red mark in the top right corner to remind you that it was revealed to be the correct answer.