This guide will show how to solve level 15, which can sometimes be confusing.
 

Solution Level 15

You have reached level 15 but can't seem make it work because you can not attach cubes diagonally.
 
 

 
 
However, if you count the cubes, you'll see that there are more than the green squares at the floor.
 
 
If you're still interested, you can quit this guide.
 
 
To view the solution part1, hover over the image above the black text.
 
Make a 3×3-square with the cubes. These will fill the empty spaces, but it's fine.
 
 

 
 
 
To see the solution part2 hover over the image above the black text.
 
Once you have the solution, you can attach the other cubes in the right positions.
 
 

 

 
 

 
 
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