Eight habits that keep a block puzzle board open
Most block puzzle games end the same way: the board is nearly full, and none of the three pieces in your tray has a place to go. The good news is that this rarely comes from one bad move. It comes from a handful of small habits, and each one is easy to change.
The advice below uses the rules of Nook Blocks: an 8 by 8 board, three pieces at a time, no rotation, and a row or column clears the moment it is full. It carries over to most classic block puzzles.
1. Look at all three pieces before you move
The order you place pieces in matters as much as where they go. Check where each piece could fit, then ask which one has the fewest options. Place that one first, while the board still has room for it.
2. Keep one wide-open area
A board with one large empty region and a few scattered blocks is much safer than a board with many small gaps. Build up from one side and leave the other side open for long pieces.
3. Treat single-cell holes as a cost
A one-cell gap can only be filled by the smallest piece, which may not show up for a while. Before you place something that leaves a hole behind, check whether another position avoids it.
4. Fill rows and columns from the edges inward
Pieces placed against a wall or against existing blocks leave fewer awkward gaps. Starting in the middle of an empty row tends to split it into two spaces that are each too small to be useful.
5. Don't clear a line just because you can
Clearing is good, but a line that is one block short is also a useful target. If a small piece is coming, you might hold the line open and clear two at once. Multiple lines score much more than the same lines cleared one by one: one line is worth 10 bonus points, two are worth 40, and three are worth 90.
6. Plan for the big pieces
Three by three squares and five-long bars are the pieces that end games. Whenever you can, keep a 3 by 3 area and a full row or column free. If you have neither, you are relying on luck.
7. Use the preview
When you drag a piece over the board, the cells it would take light up, and any line it would complete gets an outline. Move the piece around a little before you let go. It costs nothing and shows you the result before you commit.
8. Slow down when the board is more than half full
Early on, quick moves are fine. Past the halfway mark, a single careless placement can leave you with no good move for the next turn. That is the point to stop and count your options.