Super Scrabble®, manufactured by Winning Moves Games, is a big hit in Tustin, California. The game is played with 200 tiles on a 21 by 21 grid. There are premium squares aplenty, and 800+ scores in a two-person game are not uncommon.
Maliha Mahmood, author of Word Judge, directs the Tustin club and welcomes visitors. For more information, visit her web site, https://superscrabble.wordpress.com/.