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The Kaidan, or Stairs, T-Spin setup, discovered by Tetris DS player TCM-WC, is a prophecy T-Spin Double method that takes advantage of a step formation beside an empty column. After an overhang is created, a Z tetromino is platformed over the empty column and used as a base for the T-Spin Double. After performing the T-Spin Double, the empty column should be open again. The Kaidan setup is especially effective in games that reward a Back-to-Back bonus.