Start a singleplayer game on Gm-construct. If the lake in this map has no island in the middle then it is the latest version. At the spawn point turn around. Turn left and head out the exit. Stay on the right side and you will find some stairs. Turn on noclip by pressing "v". Go under the stairs and you should see a big blue wall with a pink heart in the middle. In the heart there are names of people. It is a thank you message for the AI.