A "substring" is a group of consecutive letters in a word, like STR in STRING, ABSTRACT, or CONSTRUCT. On each level, youll be given a new substring and will have to find words containing it. The rules change from level to level, switching between fast-paced bonus rounds and challenging ones with crossword-like clues, so stay on your toes!
With the Pro version of Substring, all level packs are unlocked and you get 100 free hints!