About Three Walls
Three Walls gives you three views of a shape and asks you to rebuild the solid. The front, side and top projections must all match their targets. There is also an exact block count, so filling every position that looks possible is not the solution. You need enough cubes to explain every required shadow without adding unnecessary material.
The main challenge is ambiguity: two cubes can overlap in one view and appear as a single shadow, while separating clearly in another view. A structure that looks right from the front may therefore still be wrong from the side or above. Treat the three projections as simultaneous constraints on one model.
A shadow tells you what must exist, not everything that can exist
Read empty target space as carefully as filled target space. A cube casts a shadow in all three directions, so adding it to fix one missing square may create an unwanted square on another wall. Before placing a cube, imagine its three contributions. A position that contradicts even one target is not rescued by helping the other two.
How to Play Three Walls
Start the official player, continue through How To Play, and choose GO to reach the opening stage. Locate the model grid, three projection views, BLOCKS counter and MOVES counter. The checked Stage 1 required four blocks; use the number shown in your current stage rather than assuming every puzzle has that target.
Select a height using the numbered buttons on the right. Then click a grid position to add or remove a block on that layer. Think of the layer number as part of the cube’s address. A grid square at height 1 and the same square at height 2 are different positions in the model.
Place a single cube and inspect all three projections. In our opening check, one grid click changed BLOCKS from 0/4 to 1/4 and MOVES from 0 to 1. The model and colored projections changed together. Use that simple experiment to learn which direction each view represents before building a complicated shape.
Check for red squares after each change. The official instructions identify red as a shadow that should not be present. If a new cube creates red on a wall, inspect that cube’s position and layer before adding more. More blocks cannot explain away a shadow that the target does not permit.
Use the turn arrows when the model is hard to read. The official controls say turning is free and does not count as a move. A clearer viewing angle can help you distinguish a misplaced cube from one that is merely hidden behind another; it does not replace checking the three target projections.
When every target shadow appears covered, compare the block count with the required total. Extra cubes may be concealed behind existing ones in the projections. Look for a cube whose removal leaves all required shadows intact. If you are below the target count, inspect valid positions carefully instead of placing a cube that creates a forbidden shadow.
Controls
- Mouse: click a grid position to add or remove a block.
- Right-side numbers: select the height layer.
- Arrow controls: turn the model; official instructions describe this as a free viewing action.
- Read BLOCKS for material used and MOVES for placement activity.
Tips & Tricks
- Check all three projections after every placement, not just the view you were trying to fix.
- Use empty target squares to rule out positions before building.
- Confirm the selected height before removing or adding a cube.
- If the shadows match but the count is high, look for a redundant cube hidden behind other blocks.
A practical three-view checking routine
For each proposed cube, ask: which top square does it occupy, which front square does it project onto, and which side square does it project onto? Reject positions that land in an empty target square. Among the remaining positions, favor cubes that explain missing shadows in more than one view.
Then test whether each cube is necessary. Imagine removing it and check which target square would disappear. If none would, that cube may be redundant. This reasoning is especially useful when the views look correct but BLOCKS exceeds the target; visual similarity alone is not the finish condition.
Why Play Three Walls Here
Choose Three Walls for a spatial puzzle where careful inspection matters more than speed. For a different visual constraint, Mirror Puzzle asks you to connect light paths through a chamber.
