13 cm x 2.8 cm x 3.3 cm / 5.1 in x 1.1 in x 1.3 in
This is great and well known color combination brain teaser puzzle. Arrange the cubes in a line, so that all 4 colors (red, black, yellow, green) appear simultaneously on all four sides. Each side will have a Red, Yellow, Green and Blue Dot showing.
There are also other challenges to be solved where the goal is to arrange the pieces an colors in a very specific way. Instructions included.