The ultimate grail of video games is the concept of backwards compatibility. Ever since Microsoft decided to add this concept to its Xbox One console, gamers have been raving about it. Whether you own the original version of the game or you decide to download it from the official Xbox 360 Compatibility Store, you can enjoy these free games. The amount of free games that Microsoft has added is quite large, but the following games are the best of the best.

THIRD BEST XBOX ONE BACKWARDS COMPATIBLE GAME: GUNSTAR HEROES

Gunstar Heroes is actually one of the most recent video games added to the Xbox One compatibility lineup. This game was released in the 1990s, but it was launched on Microsoft's Xbox Live Arcade in 2009. In any case, it is a classic video game, and it is certainly one of the best free games you will find on the Xbox One. It is a run and gun video game that has been critically acclaimed. The visuals are extremely impressive for its time, and the relentless pace always keeps the gameplay entertaining.

SECOND BEST XBOX ONE BACKWARDS COMPATIBLE GAME: LEFT 4 DEAD 2

Now we come to a game that was actually intended for the Xbox 360. Left 4 Dead 2 is a first-person shooter, but it has the awesome element of cooperative play. The new melee weapons and firearms added to the game are incredible, and the game has also introduced some brand new strategies. Free games shouldn't be this good, people!

THE BEST XBOX ONE BACKWARDS COMPATIBLE GAME: SOUL CALIBUR 2

Soul Calibur 2, apart from Dragon Ball Z: Budokai 3, is the greatest fighting game ever created. An HD version of the game was released on the Microsoft Xbox 360, but now on the Xbox One, it surpasses all other free games as the best. The roster of characters, headlined by Nightmare and Yoshimitsu, is incredible, the variety of weapons is a nice touch and the music is perfectly orchestrated. Overall, you won't find a better backwards compatible video game on Xbox One.