TETRIS GLOSSARY
Fractal
Also called Double Dagger · Spider · TSD stacking
A connected Double-to-Double structure, commonly made by extending an existing TSD upward while waiting for the next T. Two unrelated TSDs are not automatically a Fractal. Stacking Lab builds toward this from a 6–3 foundation.
View in the A–Z glossary →Clear sequence only: the dashed cells mark the first T. Construction and the rotation path are not animated.
The first T completes two rows.
After the first Double, the same structure leaves a second T slot.
The second T completes the next two rows.
Both Doubles are complete. The remaining blocks still need to be managed.
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