We used this website to solve a series of challenges where you start with front, side and top elevations to build the full picture of 3D shape – building up to using only two views and silhouettes.
Notes on the website
– You need to click once for adding a cube and hold the clicker down a bit longer to clear.
– When you press check, the tick is red if it is wrong, yellow if it works, but there could be fewer cubes, and green when it is correct and the minimum number of cubes have been used.