Sneaking

The sneak glitch is a weird behaviour which makes it possible to walk up the wall and stop fall in air by hold some buttons. It's make possibly by building wall blocks in a special way. A common structure abusing this bug is the so-called “sneak elevator” (see attached screenshot).

sneak bug

To abuse the sneak bug, stand at that corner and hold both the sneak key and the jump key. You will jump up the entire structure. There may be other structures which abuse this bug, but I don’t know them.

Simply activate the "Disable sneak glitch" mod and strange structures like the "sneak elevator" won’t work anymore.

Technically: What this mod does is simply setting sneak_glitch to false for all players via set_physics_override.