Almost all of the games do not exist without Easter eggs, secret rooms and hidden levels and the more interesting it, the more fans are looking for the secrets hidden by the developers. Sometimes the search does not take months or years but decades, as it’s proved by Doom 2.
The last secret in this game was found 24 years after the creation of the game!

This hard-nosed lucky who discovered the last secret was the player Zero Master. The most interesting thing is that the authors told that to activate this secret (by pressing the button in the floor to get into the secret room) by the player himself is impossible — a monster needs to hit by the top and push the character to this point.

The creator of Doom2 John Romero congratulated the player with a message on Twitter.

CONGRATS, Zero Master! Finally, after 24 years! "To win the game you must get 100% on level 15 by John Romero." Great trick getting to that secret! https://t.co/Im9BSP5Eyh #doom

— 𝕵𝖔𝖍𝖓 𝕽𝖔𝖒𝖊𝖗𝖔 (@romero) August 31, 2018