Well

Related terms

• Hole →

  An empty cell below occupied cells. It cannot be filled by a straight drop from above; some gaps allow a tuck or spin, while others require clearing the covering rows first.

• 9–0 stacking →

  Build across nine columns and leave the remaining edge column open for I pieces. Learn to keep the surface flexible without burying the well or depending on a single piece to repair it.

• 6–3 stacking →

  Stack six columns to one side of a one-column well and three to the other. The central well gives you surfaces on both sides for T-spin opportunities as well as four-line clears.