# Block puzzle strategy: keep the board open > Most block puzzle guides list tips. There is really only one idea — always leave room for the worst piece you could be dealt. Here is how to apply it. Source: https://apps.swtlm.com/blog/block-puzzle-strategy-keeping-the-board-open · TLM Apps — focused mobile apps from a team of engineers. Published: 2026-07-09 · Updated: 2026-07-09 · TLM Software Design Keep a 3×3 square of empty cells on the board at all times. That single rule beats every list of tips, because the largest piece in most block puzzles fits inside a 3×3 footprint. While that square exists you can place anything you are dealt; once it is gone you are one unlucky piece from the end. Every other habit below is a way of protecting it. ## Why you actually lose A block puzzle run does not end because you ran out of skill. It ends because you were handed a piece that does not fit, and that is almost always the consequence of a decision you made six or seven pieces earlier. This is true of every block puzzle, ours included. The mechanic is old enough that every implementation shares it, which is why the habits below transfer between them. The board has two kinds of empty space: - **Usable space** — regions big enough to take the pieces you might be dealt. - **Dead space** — single cells and awkward two-cell notches surrounded by filled blocks. They still look empty. Nothing will ever go in them. Every run is a slow conversion of the first kind into the second. Losing is just the moment the conversion completes. So the whole game is: place pieces in a way that makes as little dead space as possible, and clear lines in a way that turns dead space back into usable space. Count the pieces in your game and find the largest footprint. [Blockmatic](https://apps.swtlm.com/blockmatic) deals from a catalogue of shapes between one and nine cells. The biggest is a full 3×3 square, so a 3×3 gap is the smallest region that will accept anything it might hand you. It also has a five-in-a-row bar in both orientations, which no 3×3 gap can take. The honest version of the rule is therefore *a 3×3 square and a clear line of five*, and the square is the one that disappears first. ## Place against something, never in the middle An isolated block in open space creates awkward edges on all four sides. The same block placed flush against an edge, or against a block already down, creates awkward edges on one or two. In practice: - **Fill corners and edges first.** They have fewer neighbours to spoil. - **Grow one contiguous mass** rather than several small islands. Two islands with a two-cell channel between them have created dead space that neither can use. - **Finish the row you started.** A row that is eight-tenths full is a row that clears soon. Three rows that are each a third full are three rows that clear never. ## Clear for space, not for points This is the habit that separates a long run from a short one, and it is counter-intuitive because the score goes up either way. Ask what the clear *does to the board*, not what it pays: - A clear that empties a row in the region you were already comfortable in is worth little. You had space there. - A clear that reopens the region you are running out of is worth taking immediately, at any score. - A clear that hands you back a 3×3 is worth taking ahead of a bigger clear somewhere you can afford to wait. The multiplier is real, but it is a bonus on top of survival, not an alternative to it. You cannot chain combos on a board with one hole left. ## Think one tray ahead, not one piece Blockmatic deals three pieces at a time and refills only once all three are placed, which is the common arrangement in the genre. That is not decoration — it is the entire tactical layer. Plan the three together. Placing the awkward piece first, while you still have the most room, is usually right; the small pieces will find somewhere later. Players who place the easy piece first often discover the awkward one has nowhere left to go, having burned the space it needed on a piece that did not need it. The same principle runs through [mahjong solitaire](https://apps.swtlm.com/blog/are-mahjong-solitaire-boards-always-solvable), where the mistake is matching the first free pair rather than the pair that keeps the rest reachable. Different board, same error: taking the move that is available instead of the move that keeps moves available. ## No, the game is not targeting you It feels like it is, and in Blockmatic the tray is drawn from the shape catalogue with weights set by the difficulty setting — harder favours the large awkward shapes — without ever looking at your board. Two things produce the feeling honestly: **You only remember the piece that ended the run.** The forty that fitted fine did not generate a memory. **A tight board really is more likely to be killed.** When only one region can take a large piece, a large piece arrives with its usual probability and now ends the run. The tray did not change. Your board did. ## A practical checklist 1. Before placing anything, find your largest empty region. That is your life. 2. Place against edges and existing blocks. Never strand a single cell. 3. Take the clear that reopens your tightest area, even for fewer points. 4. Play the awkward piece of the three first. 5. When you can no longer see a 3×3 and a clear line of five, stop building and start clearing. None of it needs a timer, a life system or a streak, which is worth saying because most block puzzles ship all three. What those add is pressure to place quickly, and placing quickly is the direct cause of every dead cell above. The other [puzzle games we make](https://apps.swtlm.com/games) leave them out for the same reason, and what each one costs instead is in [what a puzzle game subscription costs](https://apps.swtlm.com/blog/what-a-puzzle-game-subscription-costs). If you want to practise the habit, [Blockmatic](https://apps.swtlm.com/blockmatic) is free, plays offline, and has no timer — so you can sit on a position and think, which is the only way any of this becomes automatic. It shows a banner and an interstitial between rounds; a one-time unlock removes both, and the card says so before you install. The rest of the puzzle games are on the [Games page](https://apps.swtlm.com/games), and [Midnight Mahjong](https://apps.swtlm.com/mahjong-solitaire) is the one to read next if you like a board where the reasoning is about what you uncover. ## Frequently asked questions **What is the single most useful block puzzle habit?** Keep a 3×3 square of empty cells somewhere on the board at all times. That is the footprint of the largest piece in most block puzzles, so as long as it exists you can always place whatever you are dealt. **Should I clear lines as soon as I can?** Not always. A clear that opens space in a region you already had space in gains little. A clear that reopens your only tight area is worth taking immediately, even for fewer points. **Where should I place pieces on the board?** Against edges and against blocks you have already placed. Every cell you leave surrounded by filled cells but too small for any piece is a cell you have permanently lost. **Is the game deciding which pieces I get to make me lose?** The tray does not read your board. In Blockmatic it is drawn from the shape catalogue with weights set by the difficulty you chose — harder settings favour larger, more awkward pieces — and nothing consults the position. It feels targeted because you only notice the piece that ended the run, and because a board with one gap left has many pieces that will end it. **Does a higher score come from combos or from surviving?** From surviving. Combos multiply what you score, but every combo needs a board with room to set it up. Players who chase combos on a tight board usually end the run before the combo lands.