All I remember (well quite a bit) he is transported into a dungeon along with others, first one in the store when it opens so he gets the beginners guide and tells others if they want it they need to pay with all the money they currently have. He blows up the tunnels of the first floor to take all the exp from the monsters and finds the hidden room. Second floor was a graveyard and he had the difficulty set to 10x due to his performance in first stage and he buys 2 robots who help him upgrade everything, he loses his arm and gets it back near the end of the stage. Stage 3 he's stuck in some alternate dimension compared to others where he has to stay for years or a year can't remember. He then returns to Earth to find it changed and the dungeon becomes common knowledge. Anyways the last thing I remember is him helping orcs to fight against the elves and humans to balance out the war currently going on, sorry for the long message and jumping from place to place.