About Super Wild Rummitiles, from BoardGameGeek:
The game uses Rummikub style tiles and shares the basic rules, but the rules are expanded to make the game more interesting and challenging. The result is a game that is a whole new experience from Rummikub.
The new rules that make it wild:
Super Wild - The wildcard works in every direction and remains wild simultaneously in every direction.
Crisscross - You can play up, down, right, or left, forward or backward.
Adjoined Groups - Bridge two similar groups with a common tile
Six and Nine - 6's and 9's are interchangeable