In several modes of play, rectangular "garbage" of various widths and heights can drop from above the playing field to add to the stack. When a block is cleared while touching a piece of garbage, the garbage piece and all same-colored garbage pieces contiguous with it are "transform"ed as a group, space by space from right to left, row by row from bottom to top. In the transformation, the bottommost layer of each piece of garbage is turned into blocks. The rising of the stack is stopped during the transformation of garbage. Until the entire transformation event is completed for the entire group, the newly formed blocks still behave as part of the garbage, and cannot be moved or used in a clear. Once the transformation event is completed the newly formed blocks move, fall and clear as normal.