Manhwa name if familiar

What I remember is the ML gets chosen with a lot of people to do a tower or something and he is in the tutorial and there are lots of difficulties he can choose from and he picks the hardest difficulty and he’s the only one who does and then gets teleported to a room that has a corridor with traps and when he goes through the first trap I think is a really fast arrow.

thats all I remember for that part but I remember another 2 parts

Another part I remember is the ML is in a different room when he sees that someone else has picked the hardest difficulty of the tower or wherever they are so then the ML messages the other person to help them but then they died or something.

The last part I remember is the ML gets to a part where the ML gets teleported to a open field with a being who gives him cake then teleports him back after a talk and also some point in it all the players get teleported to a grass field and the ML kills or attacks someone because the guy he attacked did some bad stuff in his difficulties room (all the different difficulty’s gets different rooms)