Thanks for playing, and for the feedback! You actually solved the ladder puzzle correctly lol. Multiple people have gotten stuck there, I think because players expect it to be just shooting, since it's the first time the switches are used. I should probably introduce the switches in isolation and then have that puzzle, so people know it's more complex.
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You can actually get up to it from the ground by firing two shots, so maybe that's the confusion. Now that I think about it, in a video someone made, the puzzle only clicked when they realized there was another ammo machine higher up the tower, so they could afford to use both shells at the bottom. That's another thing I could make more clear to the player.