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The 11/11 dupe was a massive duplication glitch on the server that occurred on November, 11th, 2016. The easy way to duplicate items was leaked to the 2b2t community, causing mass duping across the entire server. This was the largest duplication glitch that the server had ever seen. On 11/19, a client made to make duping easier was spread among the community. However, the client was actually backdoor'd, and people who duped using the client had their stashes leaked on the 2b2t Reddit. This did not stop players, as there were other clients to use. The 11/11 dupe ended when 2b2t was updated to 1.11 on 11/28.