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Blockmart is a Multiplayer Map introduced in the 8.2.1 Halloween update, along with the other map, named Pumpkin Island which has been removed in the 9.3.0 update.
Blockmart is a small grocery store that has been abandoned. There are cars, trucks, tanks, and more vehicles outside of it in the parking lot. While inside, you will find many isles that have been completely trashed and robbed. There is also a roof, which is possible to reach.
Use close range weapons in certain cases, like when fighting inside the market.
To get to the roof of the market, use the rocket jumping technique with a weapon such as the Grenade Launcher or Anti-Gravity Blaster and it'll get you to the top of it. There will be a hole that lets you get on top of the vents to snipe players.
Use medium ranged weapons. Despite the map's size, you will at most time need medium range weapons in order to have the best killing experience.
The map recommends players to get the Pumpkin Thrower or the Hellraiser as it is also shown on advertisements around the store.
In the left bathroom, you will see a skeleton in the last stall.
The store might resemble a place where survivors were during a zombie apocalypse since the store is completely trashed and there is blood on the walls.
There is a pumpkin face that resembles the moon just like the one from Pumpkin Island.
The map may be a reference to Wal-Mart, which is a retail store chain based in most places of the wrold (including USA, Canada, UK, and China).
However, the internal design of the store looks more like Costco, another chain retail store which is "Warehouse styled".
In the 12.6.0 update Halloween update, it was brought back with Pumpkin Island and Spooky Theme Park.