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