Brickhead Zombie

Brickhead Zombies and their world-themed variants in Plants vs. Zombies 2 are basic Zombies with armor on their heads, greatly increasing their toughness. However, unlike Knight Zombie, Blockhead Zombie and Jurassic Fossilhead, these are Veteran Zombies, which are upgraded zombies that are only added in later updates.

Almanac entry
Modern=

Brickhead Zombie
Egypt=

Pyramid-Head Zombie
Pirate=

Barrelhead Zombie
Future=

Overview
Brickhead Zombie and its variants absorb 120 normal damage shots, and their appearance change upon absorbing 37, 74, 110, and 115 normal damage shots before dying at 120 normal damage shots.

Brickhead Zombie
Modern Day: Days 37, 38, 39, 40, 41, 42, 43 and 44

Pyramid-Head Zombie
Ancient Egypt: Days 28, 29, 30, 32, and 35

Barrelhead Zombie
Pirate Seas: Days 29, 30, 32, 33, 34 and 35

Holo Head Zombie
Far Future: Days 28, 29, 31, 32, 33, 34, and 35

Strategies
Brickhead Zombie and his variants can take quite a beating, so resort to instant-kill plants to take them out. Grimrose, which is found in Modern Day, is effective at taking them out, but against groups of them, use area of effect plants like Cherry Bomb, Grapeshot, or Primal Potato Mine. You could also use Primal Peashooters to stall them as they take in damage. Using Shadow-shroom, Hypno-shroom, Chomper, Toadstool, and Chili Bean can help because they ignore their headwear. If you have enough sun for it, you can use a Magnifying Grass to take care of their headwear in a couple of hits.

General

 * The Brickhead Zombie variants are slightly tougher than Knight Zombie, Blockhead Zombie and Jurassic Fossilhead, and as tough as Mecha-Football Zombie and Disco-tron 3000.
 * The Brickhead Zombie variants have a health close to Robo-Cone Zombie, each one absorbing only 5 NDS less than a Robo-Cone Zombie.
 * Like most veteran zombies, Brickhead Zombies and their variants do not appear in Endless Zones.

Specific to Holo Head Zombie

 * Prior to 6.0.1, when a Holo Head Zombie gets killed by a Lawn Mower, its force field, arm, and head will fall off separately, but another head still appears to be encased in the force field.
 * The same also happens when killed by plants such as Shadow-shroom, where its arm, head and force field fall off and another head is still encased in the force field.
 * Additionally, when it's killed by explosive plants and Electric Blueberry, it burns into ashes, but it appears to have another head still encased in the force field.
 * This is because Holo Head Zombie's force field sprites have the head inside it.
 * After the 6.0.1 update, though, the force field is in its final degrade when hit by a lawn mower and dropped to the floor.