Spinstack

Overview
Spinstack is a single-player strategic stacking and clearing game. Pieces enter from above the board, and you rotate the concentric square base to decide which edge they fall toward. Complete a full square ring from the fourth layer outward to clear it. Floating pieces then collapse toward the center, creating opportunities for powerful chain reactions.
Design
Build outward around an indestructible core and carefully manage the growing board. Layers 0–3 form the permanent core and can never be cleared. Layer 4 and beyond can be completed and removed.
The game features the standard seven tetrominoes: I, O, T, S, Z, L, and J. Choose the base direction during the decision phase, adjust the piece while it falls, and rotate the piece or base depending on the selected mode.
Features
Concentric square board with inward-collapse physics

Clear complete rings and trigger chain reactions

Multi-ring, Combo, chain, and special-effect scoring

Four modes: Basic, Advanced, Fun, and Challenge

Three special blocks in Fun Mode:
Blast: clears a surrounding 3×3 area

Ray: clears an entire horizontal line

Prism: clears all blocks of the same color

Dynamic cloud background and rotating stack visuals

Chinese and English language support

Tagline
Rotate the base, stack your pieces, complete concentric rings, and chase massive chains as the board collapses inward.