BLOCK PUZZLE BASICS
How to Play Block Puzzles: Placement, Lines & Space
Place fixed shapes into open cells, complete full rows or columns, and preserve enough flexible space for every piece still waiting in the tray.
A block puzzle gives you fixed geometric pieces and an open grid. Place every cell of a piece onto empty board cells. Completing a full horizontal row or vertical column clears that line and returns the cells to open space.
GridD uses an 8×8 board and a tray of three pieces. Shapes do not fall and do not rotate. That removes time pressure, but it makes every occupied cell a lasting spatial decision until a line clears it.
Read all three pieces before placing one
The tray is one planning problem, not three separate moves. Find at least one legal home for every shape before choosing the first placement. If only one region accepts the largest or most awkward piece, protect that region first.
Preserve connected space
Large connected areas accept more future shapes than scattered empty cells. Avoid one-cell holes, narrow pockets, and diagonal gaps that look open but do not match any piece. The center is flexible; edges and corners are useful when a shape fits them without dividing the remaining board.
Build intersections when the board allows it
A cell can advance both a row and a column. The verified position on this page uses that fact: one horizontal piece completes the bottom row while its first cell also completes a vertical line. These intersections create space faster than unrelated single-line setups.
Treat score as feedback, not the plan
Combos and multi-line clears are valuable, but survival comes from the board left behind. When two placements score similarly, choose the one that preserves more shapes, longer lanes, and fewer isolated gaps for the next tray.
Verified position
One placement clears a row and a column
On an 8×8 board, row 8 is filled in columns 1, 2, 6, 7, and 8. Column 3 is filled from rows 1 through 7. The open cells in row 8 are columns 3 through 5.
- 01
Place a horizontal three-cell piece across row 8, columns 3 through 5.
Result. The piece completes all eight cells in row 8 and the final cell in column 3. GridD clears both lines from the same legal placement.
COMMON MISTAKES
What usually breaks the position.
Looking at only one tray piece
The obvious placement for one shape may occupy the only space that fits another. Read all three before committing on a tight board.
Creating single-cell holes
Most pieces cannot repair isolated gaps. Keep open cells connected in rectangles, lanes, and corners that several shapes can use.
Clearing without checking the result
A line clear can still leave a fragmented board. Judge the usable space after the cells disappear, not only the points earned now.
QUICK ANSWERS
Questions players ask.
Do block puzzle pieces fall automatically?
Not in GridD. You choose one of three tray pieces and place it on any matching open cells without a timer or falling-piece phase.
Can pieces rotate in GridD?
No. Each shape keeps the orientation shown in the tray, so the board must preserve spaces for horizontal, vertical, square, and irregular pieces.
When does a block puzzle run end?
The run ends when none of the available tray pieces has a legal placement. A crowded board can continue as long as at least one required shape still fits.