Blockland is a game developed by Eric Hartman. Return to Blockland is a third party mod for Blockland that includes a Mod Manager, a IRC Client and many other features.
If it is not located on RTB then you can't find it anywhere for Blockland.
you can find the zombie infection also known as Zombie mod is what they call it. Go to online servers and in the map name search for map name zm_ zm stands for zombie mod and it will bring up all the servers that are onthat map playing zombie mod. Unless you have your own server you cant play zombie mod on your custom game single player.
You can choose one of the zombie mods from the "AMX Mod X: Zombie Mods" link below.
You have to go to Return To Blockland to download stuff for Blockland.
You can go multi player and look up zombie mod servers all of them have the zm_(mapname) maps so you can search by zombie in server name or zm_ in server map. Unless you have your own server that you run you cannot play zombie mod with bots.
You disable it when you're making the server.
You go to Return To Blockland (RTB) where you can download anything for Blockland.
There is a 'mod' for it. But no official mode to play. Like, normal players cannot play zombie mode unless they install the mod, or go into a modded server.
You can install a zombie mod in the game.Download the mod from internet,then install with the given instructions.
go to amazon and search "Blockland Key"