Classic Mechanics: All 7 standard Tetromino pieces with proper rotation states.
Wall Kicks: Smart rotation logic allows pieces to shift automatically if they hit a wall or block while rotating, just like in modern Tetris.
Ghost Piece: A semi-transparent outline shows exactly where your piece will land.
Neon Visuals: Pure vector rendering with heavy use of TSkMaskFilter for glowing blocks, grid lines, and UI text.
Particle Explosions: Clearing lines triggers a satisfying burst of colored particles affected by gravity.
Progressive Difficulty: The game speed increases every 10 cleared lines.
Threaded Engine: Physics and input handling run on a background thread, synchronized safely with the main rendering thread for buttery-smooth 60 FPS.

Move Left/Right: A/D or Left/Right Arrows
Soft Drop: S or Down Arrow
Rotate: Spacebar
Pause Menu: Escape

Renderer: Pure Skia Canvas (No Game Engine, no FMX shapes, no PNGs). Everything is mathematically drawn using paths, masks, and shaders.
Threading: The game loop runs in an anonymous background thread. Inputs are collected thread-safely using a TCriticalSection and consumed immediately to prevent OS key-repeat spam.
Data Structures: Uses a custom TBlocks array type to allow direct copy assignments (:=) of rotation states, avoiding messy nested loops.
Rotation Normalization: The 4x4 rotation matrix is normalized (shifted to top-left) after rotating to prevent pieces from jumping unpredictably in the grid.

Skiatris.pas: The complete falling-block arcade engine in a single, highly commented file.
Sample project and executable included.

Open the project in RAD Studio (Delphi).
Ensure you have the Skia4Delphi library installed.
Run and play!