Super Scrabble standard "Scrabble" in "Super Scrabble" are summarized by the latter's tagline, "More spaces, more tiles, more points—add to your fun!" The board is larger; (21×21 or 441 squares vs. 15×15 or 225 squares); there are more premium squares (going up to quadruple letter and word score spaces); there are 200 tiles, twice as many as a normal "Scrabble" set. The middle 15×15 squares are identical to a "Scrabble" board, so standard "Scrabble" may be played on a "Super Scrabble" board. All the high-scoring quadruple premiums lie near the outside of the board, with the quadruple word squares at the four
Scrabble generally excluded from the OSPD4 but allowed in club and tournament play. Proper nouns and other exceptions to the usual rules are allowed in some limited contexts in the spin-off game "Scrabble Trickster". Names of recognized computer programs are permitted as an acceptable proper noun (For example, WinZIP). There are two popular competition word lists used in various parts of the world: TWL and SOWPODS (also called "Collins" or "CSW"). The memorization of two-letter words is considered an essential skill in this game. The North American 2006 "Official Tournament and Club Word List, Second Edition" (OWL2) went into official use