From GameBrew - a wiki dedicated to Video Game Homebrew.
Legocad is a software program for the NDS that allows students to design or reproduce their LEGO models on a computer, which will create a permanent copy of the model.
Draw bricks (3D boxes of different sizes).
In the main window, you will see a few icons, on the right are the different perspectives. Top and bottom do not work.
On the left are the different brick available for you to choose from.
D-Pad - Move block around
X - Cement block (you will not be able to go back to it)
R - Flip screen