I know Puff-Shrooms are overpowered in the first game's night levels, but IMO making them self-delete is too big a nerf. It would make more sense to halve their HP; it's small, so it shouldn't take a zombie as many bites to eat it.
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I disagree, it's still one of the best plants in the game, a almost obrigatory pick in every night level, and it takes so much time to die that when your first puffshroom die from age you already has 2 or 3 in everysingle lane and has builded your economy. Buffing then in any way would make night levels way to easy.