BB01 Contains 10 secrets.

Secret 1 : In the courtyard with the open grave, step into the coffin with blood inside, a panel on the opposite wall from the lamp will open to reveal a small space.
Contains : Voodoo doll

Secret 2 : In the courtyard with the severed leg and tombstones there is a single tree. Step up to this tree and push the dark stone wall behind it. It will lower and present a lift. Proceed up this lift to a small vantage point above.
Contains : Flare pistol, two boxes of flares and a crystal ball

Secret 3 : The small crypt with the large rotating wall has two stone murals on either side. Pressing on your left upon entry will reveal a small enclosure.
Contains : Jumping boots

Secret 4 : The courtyard with the severed leg and tombstones contains an explosive barrel. Destroy the barrel and enter the tiny enclosure it reveals.
Contains : Spirit armour

Secret 5 : Destroying the explosive barrels in the tiny store room with the elevator reveals a secret space.
Contains : Fire armour

Secret 6 : The large, semi-circular hedge maze contains a secret. When facing the moon from its far side, proceed to the left maze ending and push it. This will expose a secret button. Push the button and the centre stone column will lower, exposing your prize.
Contains : Life seed

Secret 7 : Pulling the hedge clippers in the small chamber with the tools and candles will cause some of the nearby boxes to lower, revealing a small space.
Contains : Super armour

Secret 8 : There is a small chamber overlooking the courtyard with the severed leg containing a skull with a candle on it. Press the nearby cupboard and it will present you with a prize.
Contains : Super armour

Secret 9 : When entering the crypt with the walls that lower, move to the casket on the far side and push it. It will move towards you to expose a secret passageway.
Contains : Tommy gun and 4 shotgun shells

Secret 10 : In the small passage accessed through secret 9 there will be a wall of stone. Push it and it will roll away from you.
Contains : Nothing, but provides a path to another part of the map

BB02 Contains 6 secrets.

Secret 1 : There exists a small room with a bed and a furnace nearby. Push the nearby grandfather clock and it will open to reveal a secret space.
Contains : Two remote detonators

Secret 2 : Jump behind the couch with the nearby fireplace. A button will be visible on the back of the couch. Pressing it will open a small chamber just below and to the left of the grey mural that you'll see on the opposite side of the room.
Contains : Super armour

Secret 3 : If you're standing on the balcony overlooking the couch and fireplace, proceed into the small passage behind you and press the left wall. It will raise to reveal a secret passage.
Contains : Dynamite bundle and a voodoo doll

Secret 4 : In the exterior courtyard with the statue there are two flaming torches in front of a doorway. Use these as leverage to get on top of the hedges. Once on the hedges, proceed to jump toward the platform with the plant growth on it. Walk on these and you'll find a small stash of items. From here you can open the left wall and find a shortcut to another area.
Contains : Two boxes of flares, a case of TNT and a doctor's bag

Secret 5 : In the mansion there are two types of floor; a grey, irregular stone and grey bricks. In the passage which connects these two floor types, there is a round, redbrick platform. There is a fire on one side of this circle looking up, you'll see a button. Fire at this button and the entire platform will raise to expose a secret passage.
Contains : Two proximity mines and a cloak of invisibility

Secret 6 : If you stand on the high, tiny wooden bridge, face the pool and then turn and head left you'll come to a small shadowy passage with full drums of bullets in it. The right wall here can be blown open to reveal a secret nook.
Contains : Guns akimbo

BB03 Contains 0 secrets.

How dull!

BB04 Contains 0 secrets.

Very uninspiring.

BB05 Contains 0 secrets.

I'm disappointed.

BB06 Contains 2 secrets.

Secret 1 : Walk up to the left (square) wall of blue's base and push it. It will lower, allowing you to walk onto it if you're on the second level.
Contains : Life leech

Secret 2 : Walk up to the left (square) wall of red's base and push it. It will lower, allowing you to walk onto it if you're on the second level.
Contains : Life leech

BB07 Contains 0 secrets.

Secrets? What secrets?

BB08 Contains 0 secrets.

No fun to be had with secrets, though.

BB09 Contains 5 secrets.

Secret 1 : On the second level of the office complex there will a crack in the wall near the proximity mines. Use explosives on this crack to access the next office.
Contains : Life leech and 2 full drums of bullets

Secret 2 : On the second level of the office complex, either in the passage or from secret 1, there will be a crack. Destroy either of these to access the storage area.
Contains : Flare pistol, two boxes of flares and four spray cans

Secret 3 : Across from the men's room, there's a crack in the wall. Use explosives on this crack to access a secret stash.
Contains : Seven remote detonators and three lots of 4 shotgun shells

Secret 4 : If you stare at the door to the ladies' room, turn right and take the first door on your right, there'll be a crack to the left of the room. Use explosives on this crack to access the next office.
Contains : Sawed-off shotgun, two spray cans and a can of gasoline

Secret 5 : If you use explosives on second door to the left of the Christmas tree, it will explode open to reveal a prize.
Contains : Life seed

BB09 Contains 0 secrets.

Not very powerful.

BB10 Contains 0 secrets.

Of those 15, none are secret.

CPBB01 Contains 2 secrets.

Secret 1 : Upon entering the one entrance of the crypt there are some cells used to contain corpses. There is a crack in the far right one. Use explosives and enter it.
Contains : Fire armour and a trapped soul

Secret 2 : The smaller entrance to the crypt, with the pile of soil with a spade in, has a crack in the stony wall. The crack is just before the gasoline canisters. Blow the wall open to access the rest of the graveyard.
Contains : Full drum of bullets, a box of shotgun shells and a life leech

CPBB02 Contains 0 secrets.

Pitiful.

CPBB03 Contains 0 secrets.

Unlucky.

CPBB04 Contains 0 secrets.

How uninspiring.