6 Techniques for Solving Sliding-Block Puzzles
The first ten levels of Squad Car Escape can usually be solved by trial and error. From the Officer rank onwards that stops working: par climbs from six moves to more than thirty, and random shuffling tends to make the lot more crowded, not less. The good news is that sliding-block puzzles reward a handful of reliable ways of thinking. Here are the six techniques we lean on ourselves when we play through the harder ranks.
1. Work backwards from the police car
Don't start by moving whatever looks free. Start at the police car and ask one question at a time:
- Which vehicles are between the police car and the exit?
- For each one: which way must it move to leave the third row, and how many free spaces does it need?
- What is standing in those spaces?
Keep asking until you reach a vehicle that can move right now. That vehicle is where your solution starts. This "blocker chain" is exactly how we walked through level 1 in the beginner's guide, and it scales to every level in the game.
2. Count the spaces a vehicle needs
Every upright vehicle crossing the third row has to move far enough to leave it completely:
- An upright car covering the third row needs to end up entirely in rows 1–2 (above) or entirely in rows 4–5 or 5–6 (below).
- An upright truck is three spaces long, so it can only clear the third row by sitting in rows 4–6 — the bottom half of its column. There is no room above it.
3. Decide which way before you move
An upright car blocking the third row can often go either up or down. One direction is usually a dead end. Before moving, check both sides: what would have to move to make room above, and what would have to move to make room below? Pick the side with the shorter chain. Many "impossible" positions come from sending a blocker the wrong way early and then having to undo half a dozen moves.
4. Think about where things will be, not where they are
Harder levels require you to move a vehicle temporarily — out of the way for a moment, then back again later. That feels wasteful, but the minimum solutions for the Detective and Chief ranks are full of these "parking" moves.
A helpful habit is to look for spaces that will stay empty. If a corner of the lot isn't involved in any blocker chain, it's a safe place to park a vehicle while you rearrange the rest.
5. Choose how far to slide
A move counts once no matter how far the vehicle travels, so it is tempting to always slide things to the end of their lane. Often that is right: it creates the most room in one move. But not always. Sliding a car to the very end can block another lane that you need later, costing you two extra moves to fix.
Before letting go, glance at the lane you are about to fill. If a vehicle in your chain will need that space, stop one square short.
6. Use undo and hints to learn, not just to escape
Undo is free. If you are not sure which of two moves is better, try one, look at the new position for a few seconds, and undo if it doesn't help. Only the moves you keep are counted, so exploring has no cost.
The hint button is also a teacher. It shows the optimal next move from your current position, and it is often a move you would not have considered. When you use one, ask yourself why that vehicle, and why that distance. Hinted solves are capped at two stars, but you can always replay the level for three once the idea has clicked.
Putting it together on a hard level
When you open a Chief-rank level, try this routine before touching anything:
- List every vehicle crossing the third row to the right of the police car.
- For each, decide up or down and how many spaces it needs (technique 2 and 3).
- Find the vehicles occupying those destination spaces, and repeat.
- Spot any safe parking spots (technique 4).
- Only then start moving, from the end of the chain back towards the police car.
The final level has a par of 31 moves, and it is very satisfying to beat. Take your time — there is no clock.
Curious how we made sure every level can actually be solved? Read how we built 40 guaranteed-solvable puzzles.