What games tiles tiles must form words which, in crossword fashion, read left to right in rows or downwards in columns, and be defined in  a standard dictionary or lexicon, Scrabble or Take It Easy?
Scrabble Scrabble is a word game in which two to four players score points by placing tiles bearing a single letter onto a board divided into a 15×15 grid of squares. The tiles must form words which, in crossword fashion, read left to right in rows or downwards in columns, and be defined in a standard dictionary or lexicon.
Challenge (Scrabble) In the game of Scrabble, a challenge is the act of one player questioning the validity of one or more words formed by another player on the most recent turn. In double challenge (most common in North American tournaments), if one or more of the challenged words is not in the agreed-upon dictionary or word source, the challenged player loses his turn. If all challenged words are acceptable, the challenger loses his turn.