This series also introduced paper boxes, instead of the plastic bags, making it no longer possible to feel up the pieces for each figure.

The series consists of a number of individually themed collectible Lego minifigures based on movies, sports, history, and popular culture.

[1] The figures are sold individually in sealed, unmarked packets, giving customers a random chance at obtaining any particular figurine.

While considered a novel approach by some, it has raised controversy amongst enthusiasts and collectors, increasing the amount of difficulty in obtaining a complete collection.

This allowed customers to identify individual figures within the packet, significantly decreasing the amount of money and effort required to obtain a complete collection, and eliminating the possibility of unintentionally receiving duplicates.

[4] Lego has eliminated the figurine-specific barcodes on all Series 3 and 4 packets and replaced them with a braille-like system of dots embossed in the lower seal of the bag.

In September 2021, Matthew Ashton, The Lego Group's Vice President of Design announced the Collectible Minifigures alongside City, Friends, Creator, Lego Classic, Technic, Speed Champions, Monkie Kid, Ninjago and DOTS (Formerly) themes will continue until at least 2023.

We'll have a rough wish, but we know that we'll have limitations, and we go to the sculptors and they come back with their proposal, and we always have a mould engineer sitting in on our weekly design meeting so that they can flag things right away.