Eggwars iron trapdoors????

Hi there, is was playing a eggwars game in oriental but the i saw someting strange. The yellow team was placing iron trapdoors at the side of their brige. I looked in the shop but there wasnt anything like it so how did they get them???

 

With the iron that you collect, you can craft the iron trapdoors in your inventory crafting bench by putting 2 iron ingots next to each other to get them.

 

Question has been answered Don't worry about it by the way, trapdoors serve no purpose in the game.
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