Lincoln, leading Xiaomeng, headed directly to Stormy Ocean on the lunar surface.
Then at the center of the most prominent lunar crater in Stormy Ocean — [Kepler Crater], he placed a pure black rectangular stone slab with proportions of [1:4:9].
— Absolute [1:4:9], under current conditions, this is absolutely impossible in reality, but in the virtual world it is simply trivial, just filling in numbers. Besides, the virtual world does not have such an explosively precise ruler...
Then it was Copernicus Crater, Archimedes Crater, Plato Crater...
Every striking crater seen from space, every famous crater in the lunar maria, Lincoln and Xiaomeng placed a pure black stone slab with proportions of [1:4:9] in its very center.
Of course, Lincoln also programmed it so that players would only find one black stone slab on the moon.
After finding the first one, the other slabs would automatically disappear, ensuring the uniqueness of the first slab.
As for the purpose of this slab?