Ready now
3×3 fits now
A contiguous 3×3 opening exists before any move. The engine finds an initial placement for the square and a complete sequence for this tray.
Difficult-shape planning
Block Blast 3×3 Block Guide
See when a 3×3 block fits now, when a line clear creates room, and when the current tray cannot open a legal placement.
Why a 3×3 block needs a real square opening
A solid 3×3 block occupies nine connected cells at once. Nine empty cells scattered around the board are not enough: the current board must contain three adjacent empty rows across the same three adjacent columns, either now or after an earlier line clear.
Three engine-backed 3×3 situations
Change the board first
Clear first for 3×3
The 3×3 has no legal placement at first; a single-cell piece completes a row, the row clear removes its cells, and that creates the required square opening.
Still blocked
3×3 stays blocked
The checkerboard fixture gives the square and both five-cell lines no legal first move, so the current tray cannot create space.
Try all three boards in the solver
Choose one of the three page-specific examples below. Each button loads the exact tested board and current tray into the editable solver.
Step 1
Mark the filled board cells
Click, tap, or drag to paint. Row 1 is the top row.
Step 2
Enter the three fixed pieces
Choose a preset or draw the exact orientation you see.
Current tray
Piece 1
Choose a preset
Single
Lines
Squares and rectangles
Corners
Draw a custom shape
Current tray
Piece 2
Choose a preset
Single
Lines
Squares and rectangles
Corners
Draw a custom shape
Current tray
Piece 3
Choose a preset
Single
Lines
Squares and rectangles
Corners
Draw a custom shape
Step 3
Choose a strategy and solve
Verified inputs
Try a verified example
Complete
3×3 fits now
Start with one contiguous 3×3 opening already available.
Complete
Clear first for 3×3
Complete a row first so its cleared cells open a 3×3 pocket.
No first move
3×3 stays blocked
See a crowded board where none of the three entered pieces can move first.
A practical 3×3 space checklist
- Scan for three adjacent empty cells across three consecutive rows.
- If no square exists, check whether another current piece can complete a row or column bordering a near-square pocket.
- Compare move orders before filling one of the few cells that keeps a 3×3 opening usable.
- If none of the current pieces has a legal first move, treat the entered tray as blocked instead of assuming a later piece will help.
Evidence boundary
These fixtures verify only the entered 8×8 board and three fixed pieces under provisional-classic-v1. They do not predict a future tray, official scoring, game-over behavior, piece frequency, or platform-specific controls.