For more, check out GameSpot's guide to how to unlock the Sai melee weapon (and get a reward of 5000 XP!) in both Black Ops Cold War and Warzone. This event only runs for two weeks.

New Weapons And Operators Across Black Ops Cold War and Warzone, players can look forward to a new Operator, Hudson, as well as the Sai melee weapon which can be unlocked by completing a new ...

By completing all nine challenges in either one of the games, players will be rewarded with a new melee weapon, the dual-wield Sai. Each challenge will also give players smaller rewards such as in ...