The reverse of Explosive Grid. Instead of starting at the center of the main grid, associating radially outwards to the four corners, and starting new Radial games at each corner, you start with four Reverse Radial games, associating to the yellow square at the center of each. The words in the yellow squares (which must be bold, by the way) then serve as the starting words for the respective corners of the main game, and, again, you associate inwards from there to the center. It's like Condensive Grid, except starting with four Reverse Radial games rather than four Ultra games.
All of Game #1's starting words were chosen via Random Article.
This grid goes to square AA in the main grid.
Grid #1's starting words, Western rock nuthatch, Secrets Secrets, Charlie Wilson (baseball), and Nicholas Bingham, were chosen via Random Article.
This grid goes to square AG in the main grid.
Grid #2's starting words, Acanthamoeba keratitis, Pradell de la Teixeta, Crazy Mountain National Forest, and 1993 Memorial Cup, were chosen via Random Article.
This grid goes to square OA in the main grid.
Grid #3's starting words, Eat Bulaga!, Françoise, Village of East Davenport, and George Nelson Preston, were chosen via Random Article.
This grid goes to square OG in the main grid.
Grid #4's starting words, List of largest chemical producers, Randi Øverland, Agononida callirrhoe, and Le Viager, were chosen via Random Article.
Do not start filling the rest of the main grid until ALL FOUR of the corners are filled!