Power is a map-state milestone: when a map uses it, activating power can make other systems or routes relevant. Pack-a-Punch is the weapon-upgrade system and official badge evidence includes a challenge involving Pack-a-Punching multiple weapons in one match. Neither fact establishes a universal location, price or door order.
Start by identifying the map, reading its visible prompts and locating checked guidance. On The Giant, this site can confirm the systems and map context but still withholds an incomplete exact Easter egg route. Other maps may use different flows. If the live experience disagrees with a guide, prefer the live state and check the guide's date.
Do not transfer Call of Duty prices or steps into Michael's Zombies simply because the terminology is familiar. The on-site map routes are separated precisely so a verified mechanic can coexist with uncertain map-specific procedures.