Later memory sequences get incredibly involved, as hazards are introduced that will either move your blocks in a specific direction or force you through areas that will not allow you to spawn blocks at all. (darkstation.com)
With how surprisingly long the game is, there are plenty of memory sequences - some far more exciting and important than others. (darkstation.com)
I expect the DLC to be story that can be accessed anytime after you leave the great plateau, but personally I'm hoping for it to be a playable memory sequence. (gonintendo.com)