The initial state of the Tetris puzzle is set on a 6-row by 4-column grid. The grid positions are connected horizontally and vertically to their immediate neighbors. The following positions are clear and available for pieces to move into:

- Row 5: All positions (f5-0f, f5-1f, f5-2f, f5-3f) are clear.
- Row 4: All positions (f4-0f, f4-1f, f4-2f, f4-3f) are clear.
- Row 3: Positions f3-2f and f3-3f are clear. An "L" shaped piece ("rightl0") occupies positions f3-0f and f3-1f.
- Row 2: Positions f2-1f and f2-3f are clear. The "L" shaped piece ("rightl0") occupies position f2-0f. A single-square piece ("square1") occupies position f2-2f.
- Row 1: Position f1-3f is clear. Another "L" shaped piece ("rightl1") occupies positions f1-0f and f1-1f. A single-square piece ("square0") occupies position f1-2f.
- Row 0: Positions f0-1f, f0-2f, and f0-3f are clear. The "L" shaped piece ("rightl1") occupies position f0-0f.