The recent Call of Duty 2020 teaser site has been updating daily with strange VHS tapes filled with American history. Each day, Call of Duty fans flock to the site in hopes of discovering the next big secret leading to the 2020 reveal. As the tapes started to pile up fans noticed on strange detail.
Each tape has a colored dot associated with it. These dots match the same colored dots as is on each of the many cipher-based puzzles found each week. As players dive into different bunkers, rooms, and safe houses they are continuing to discover pieces of these strange puzzles.
Each color can be thought of as a different code, and this week's color is Blue, making the Blue dot ciphers the center of fan attention. Each of the ciphers is dramatically different from the others with little to no instruction on how they are to be solved. The blue series is known as the "CHEM" puzzles provide players with a list of compounds. Each compound is associated with a number, and a strange line with 24 spaces can be seen at the bottom. Two spaces are filled in, presumably to give players a guide, but to date, no one has solved this strange Call of Duty puzzle.
The one hint that fans are given is "Use the Hill System and Disregard Subscript Integers." This is referring to the Hill System notation used by chemist to shorthand complicated compounds. By denoting the elements and assigning a subset integer to represent the number of said element chemists are able to read quickly and understand the composition without having to look at a diagram. Using the Hill system each of these complex compounds can be broken into short letter-based codes, and with no subscript integers they end up as just small words.
Gathering each of the words was as far as the mysterious cipher leaker Activ has made it. The puzzle feels as if it is missing a crucial piece or some level of guidance to fill out the upper bar. With 24 different elements involved, and 24 different spaces on the bar the two must line up in some fashion but fans are still trying to work it out.
There are a total of five different color-coded puzzles found each as complicated as the next. They are all designed on old Cold War-era counter-soviet coding. Each of these is pulled from history leaving fans to search in the past for solutions in the present.
Call of Duty 2020 is being developed by Treyarch and Raven Software.