TETRIS GLOSSARY
Fractal Cave
A Fractal-related construction using an STMB Cave above an incomplete TSD. The upper spin must leave the intended lower slot usable after its rows disappear.
View in the A–Z glossary →Related terms
Fractal →
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.
STMB Cave →
A floating TSD made by hanging S or Z across a three-column gap. Because the spin sits above empty space, verify the supporting corners and the board left after clearing.