i'm getting more disappointed as the series goes on. I'm failing to understand why the author is intentionally making the MC play dumb/lie about the crevasses to his friends (at least his reasons, or even just the fact that he knows something about them without going into details). I also feel bad for the people in this realm because the author has made them all kinda...dense. like why has no one, not even MC, asked "if this is the tutorial tower, what comes after?" Like you don't need to play games to know what a tutorial is
like just mention it once already please! A passing comment, even! Mob and/or friend A: "it's already been 12 years since the tutorial tower appeared, will there be a new set of towers?" Q: "Are the dungeons the end of it?" "Why a tower for the tutorial if it's to prepare for a dungeon/field/crevasse?" A: "Who knows? For now we'll just focus on the tutorial tower and dungeons and watch out for new developments." One panel! Two! Done! Something to give me faith that the author is actually giving some thought to their story/world building! Flat characters and flat world make me sad 
but maybe it will be as simple as the climbers are just inspired by folklore. Either way i like generally fusion fantasy concepts. Btw, the admin girl already mentioned (i think it was during her first appearance?) that the creature that our MC defeated in the first crevasse wasn't a climber. So the folklore theory for climbers still works!