Build with Legos! Click to drop a block, and space to change the color. Press n to change the background. Use the up and down arrow keys to change the size of the brick, and the left and right arrow keys to rotate it. If you are putting legos next to each other, you may want to put them left to right and so that it looks better. Also, if you are stacking blocks it looks better to go from down to up. Have fun!