Some user-created maps in the Arcade reimagine stealth or Nova-themed missions, though these are not the official campaign.
StarCraft II itself is free-to-play, it's important to clarify that Nova Covert Ops is a paid DLC and is not officially available for free
: There are three mission packs, each containing three missions.
free download," you’ve likely seen some confusing information. Because the base StarCraft II game went free-to-play years ago, many players assume the DLC followed suit.
The Truth About "StarCraft II: Nova Covert Ops Free Download"
Alternatively, check if you own StarCraft 2: Campaign Collection . Many players who bought Legacy of the Void at launch received Nova Covert Ops at a discount. Currently, the only way to get the full "Free Download" is if a friend who owns the DLC logs into your computer (Blizzard allows offline play for campaigns).