The Glenlivet Enigma was the fourth in the “Mystery Series”, a range in the 2010s that featured the Alpha (2013), Cipher (2016), Code (2018), Enigma (2019), and Spectra (2020). These bottles usually came with little to no details on the packaging or website and encouraged drinkers to explore the range of experiences Glenlivet had to offer without relying on marketing guidance. Some bottles featured puzzles or other clues the consumer could solve to reap notes or facts about the bottles in question. The Enigma was the highest-proofed offering from the series.