Sword Art Online

Plot Summary: The only way to escape is to 'clear' the game. Death in game means actual 'death' ---- The ten thousand who have logged onto the as of yet mysterious game 'Sword Art Online' using their Nerve Gear have been forced into this perilous death game and are trapped inside. 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 and leaving this twisted virtual world, he must get through all 100 floors. Will Kirito have what it takes to clear the game, or will he die trying?

http://swordartonline.wikia.com/wiki/List_of_Sword_Art_Online_episodes

The Legend of the Legendary Heroes

Ryner Lute is a lazy student of the Roland Empire Royal Magician’s School. One day, the Roland Empire goes to war against a neighboring country Estabul, and Ryner loses his classmates in the battle. After the war, at Emperor Sion Astarl’s command, Ryner sets out on a journey to find the relics of a “Legendary Hero”. During his quest, he finds out that a deadly curse is spreading across the continent.
For more check out link below:

http://thelegendofthelegendaryheroes.wikia.com/wiki/Alpha_Stigma_Wiki

Psycho-Pass

Plot Summary:In the near future, it is possible to instantaneously measure a person's mental state, personality, and the probability that a person will commit crimes with technology called the Dominator. Just thinking about a crime can make you guilty, and in this world there is no mercy for criminals. Detectives work in pairs--one Enforcer and one Inspector--with Enforcers delivering lethal justice, and Inspectors making sure their partners don't take things too far. The story follows Enforcer Shinya K?gami, who must solve and manage crimes in this dark future.

Beyblade Metal Masters

Metal Masters is the second season of The Metal Saga and the the fifth season of the Beyblade anime. It premiered in the United States on Saturday, August 20, 2011 at 8:30 AM on Cartoon Network with three back-to-back episodes. It first premiered in France on June 21, 2011 and in the UK on January 9th 2012. It's preceded by Beyblade: Metal Fusion and succeded by Beyblade: Metal Fury.
Now the story starts with Ginga and his friends meet a new Blader named Masamune Kadoya. Masamune is a new Blader who joins Ginga's group and will stop at nothing to defeat him. The WBBA sponsors the new "Beyblade World Championships", a world tournament where four representatives from each country around the world gather and battle to become the world champions. When Ginga, Masamune, Tsubasa and Yu are chosen as the representatives of Japan, they won't hold anything back to become the world champions! Kyoya was chosen but turned the opportunity down, as he wants to battle Ginga, and joins the African Team along with Benkei who masquerades as the Masked Bull. They must then secure the spot of being the strongest Bladers in the world! All about beyblade metal masters:
http://beyblade.wikia.com/wiki/Beyblade:_Metal_Masters

Hunter X Hunter

Gon Freecs, a young boy that lives on a small island learns that his father who he doesn't remember is an extremely famous man and has become somewhat of an amazing hunter. Gon takes the hunter exam to seek out his amazing father, but on the way while teaming up with 3 other candidates, Kurapica, Leorio, and Killua, he learns that there is more to becoming a hunter and the challenges that he must face will be beyond his imaginations.

Twelve-year-old Gon Freecss one day discovers that the father he had always been told was dead was alive and well. His Father, Ging, is a Hunter--a member of society's elite with a license to go anywhere or do almost anything. Gon, determined to follow in his father's footsteps, decides to take the Hunter Examination and eventually find his father to prove himself as a Hunter in his own right. But on the way, he learns that there is more to becoming a Hunter than previously thought, and the challenges that he must face are considered the toughest in the world.

Yugioh

Now there are many version but I know that many will agree that the original is the best:

Yu-Gi-Oh! tells the tale of Yugi Mutou, a timid young boy who loves all sorts of games, but is often bullied around. One day, he solves an ancient artifact known as the Millenium Puzzle, causing his body to play host to a mysterious spirit. From that moment onwards, whenever Yugi or one of his friends is threatened by those with darkness in their hearts, this 'Dark Yugi' shows himself and challenges them to dangerous 'Shadow Games' which reveal the true nature of someone's heart. As the series progresses and its focus shifts to the fictional card game known as Duel Monsters, Yugi and his friends learn that this other Yugi inside of his puzzle is actually the spirit of an unnamed Phaoroah from Egyptian times who had lost his memories. As Yugi and friends attempt to help the Pharaoh regain his memories, they find themselves going through many trials and facing off against others wielding the mysterious Millenium Items.