Proseka ULTIMATE (プロセカULTIMATE) is an ongoing song contest similar to Proseka NEXT, but with the goal to add super difficult songs (MASTER 33-36) to Project SEKAI COLORFUL STAGE!. The winners of this contest will receive ¥50,000 Amazon gift certificate code and a certificate. Applications started on May 1, 2022 and will end on July 31, 2022. Three songs will be chosen; these songs will be added to the game sometime between December 2022 and June 2023.