The KV-2 (ZiS-6) is a gift Soviet heavy tank. It was introduced in Update 1.59 "Flaming Arrows" as a premium pack but was removed from the store at the end of the 2018 6th Anniversary sale. It was available from the store for a short time during the 2019 "Black Friday". It was also made available for purchase in-game with Golden Eagles during the 2021 "Defender of the Fatherland", and the 2019, 2022, and 2023 "Tankers' Day" mini-events and finally returned as a permanent premium vehicle you can buy with GE during the 2024 "Anniversary of lifting the Siege of Leningrad" mini-event.

This tank is a spiritual successor of the original KV-2 in combat operations. Despite its high crew count of 6, the rate of fire is relatively slow; it is however faster than the howitzer-equipped KV-2s, with a higher velocity and flatter trajectory. It does share the same unfortunately slow turret traverse, reverse, acceleration, and heavy weight.

Operational and visual characteristics of the KV-2 (ZiS-6) retain the visual and operational similarities to the KV-2 which it is upgraded from. Players experienced in operating previous models of the KV-2 or Soviet SPGs should have little to no difficulty in adjusting to this vehicle. The ZiS-6 can be distinguished from its KV and KV-2 predecessors by its enlarged and tall rectangular turret and longer barrel. A quick glance at this vehicle may be mistaken for similar looking tanks such as the KV-2 in which shares the same turret shape.

The KV-2 (ZiS-6)'s closest and most popular competitor of the same battle-rating is the KV-85. The KV-85 when compared, is free to unlock with currency spending, is lighter in weight, more manoeuvrable, faster in fire rate and turret traverse at the expense of fewer crew members. What the ZiS-6 lacks in these qualities may be compensated by its firepower comparable to a "mini-IS-2" as well as the added Premium talisman RP and SL increase bonus of which the KV-85 will lack on the get-go. These detail and information should be considered by the interested user when deciding whether to purchase this tank and incorporating it into their existing arsenal, or when taking into battle. The KV-2 (ZiS-6) will reward those who are patient, and is a boon to those seeking increased premium firepower unmatched by any other USSR vehicle at its rank.