Sword Art Online - Aincrad

The year is 2022. Mankind has finally perfected virtual reality. And within the VRMMORPG (Virtual Reality Massively Multiplayer Online Role Playing Game) Sword Art Online, there was a player called Kirito. While he was enjoying the world of SAO, he and the other 10,000 logged-in players all received a frightening message from the Game Master—that the only way to escape from that world was to clear the game, and that a game over within the game would mean their death in the real world.
That was the frightening true story behind this game.
Kirito was one of the first players to accept this “truth”, and began his solo play, refusing to form a party, as he threw himself into the never ending battles that lay before him…
Adaptation of Sword Art Novel
The only way to escape is to 'clear' the game. Game over means actual 'death' ----
The ten thousand who have logged onto the as of yet mysterious game 'Sword Art Online' have been forced into this perilous death game.
Protagonist Kirito, one of the many gamers, has greeted this 'truth'.
He plays as a solo player in the giant castle that is the stage for this game ---- 'Aincrad'.
To meet the conditions of clearing the game --- getting through all 100 floors, Kirito fights his way through this quest alone.