Ten hidden Cappys are concealed in Fallout 4: Nuka-World. Finding all 10 Cappys will unlock a special reward hidden in the locked office of Nuka-Cola creator John-Caleb Bradburton.

To find the Cappys as part of the Cappy in a Haystack Quest, first talk to Sierra Petrovita in Nuka-World USA. She'll give you a set if Capy Glasses. You must equip these glasses to find hidden Cappys...without them, the cappy textures are invisible.

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Hidden Cappy Locations

Two hidden Cappys are located in Dry Rock Gulch. The first is hidden on the back of a tomb in the small graveyard near the corral.

Cappy get!

The second Cappy is located in Mad Mulligan's Mine along the main quest route. The Cappy is printed on the side of the house near the waterfall.

Watch out for bloodworms nearby.

Another Hidden Cappy is located in Nuka-Town USA. Facing Fizztop Mountain, move left along the lake.

The wall to your left, just before the building with the orange tiers, hides another Cappy.

The fourth Cappy is hidden in the Fun House in Kiddie Kingdom in the room with the spinning floor.

Opening one of the doors along the outer edge reveals this Cappy, but watch out for the radiation spray trap inside. Use Rad-X before entering.

The fifth Cappy is hidden in a burned out tower just outside the main entrance to King Cola's Castle.

Climb to the top floor and you'll spot Cappy on an interior wall.

The sixth Cappy is located in the Galactic Zone.

Around the corner of the Star Control exterior, past the main window to the left of the lower level window, pass beneath the stair and then peel right toward the Employees Only sign.

Another Cappy obtained!

The seventh Cappy is also in the Galactic Zone, just outside the top of the Star Walk.

If your walking up the tunnel it appears to your right.

The eighth Cappy is in the Bottling Plant, printed on the side of one of the Old West-style buildings.

Turn around facing against the flow of the river to spot it.

The ninth Cappy is in Safari Adventure, hidden in the Hedge Maze down a dead-end path.

One more to go!

The final Cappy is also in Safari Adventure.

Look behind the base of this gorilla statue and grab the last hidden character.

Cappy Rewards

Warning: some story spoilers below!

Once you have all ten Cappys, head to Nuka-Town USA and meet Sierra outside Bradburton's office. She'll solve the riddle of the code. Use the keypad to open the door and head up to the office.

A hidden panel on the side of the soda machine will open a wall and reveal an elevator. You can ride down to a concealed Vault. Inside, you'll find the frozen, still-living head of Bradburton.

Bradburton will ask you to kill him, putting him out of his long life of misery. If you choose to do so, he'll open his Vault and reward you with the Nuka-Cola formula (which Sierra will pay handsomely for) and the Nuka-Launcher, a super-powered variant of the Fat Man.

The Nuka-Launcher is almost twice as powerful as a stock Fat Man/Mini Nuke combo, but uses special ammunition.