First it wasn't really in a game, but a Easter egg they say herobrine is notch evil brother and he want to take revenge and herobrine is kind of a developers joke BUT he became part of the game.
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The only way to spawn herobrine in minecraft is to use mods as you cannot spawn him in vanilla minecraft.
you can't.
Herobrine doesn't spawn.
The great myth of Herobrine is hard to defeat. He can break through any type of block and he is apparently in creative mode able to spawn block.
no