The Adventures of Cookie & Cream had dynamic splitscreen based on progress through the level, and that was released in 2000. Plus I believe there was an (uncom

The Adventures of Cookie & Cream had dynamic splitscreen based on progress through the level, and that was released in 2000. Plus I believe there was an (uncommon?) feature where two players could share a single controller to control each character (two shoulder buttons and an analog stick). (Even with an Action Replay I remember that game being frustrating as hell.)