10 Most Replayable Sci-Fi Video Games Of All Time

10. Fallout 3

Fallout 3's 2008 release saw the franchise move into the world of 3D graphics, and although the presentation of the Commonwealth had changed dramatically, it came at no sacrifice to the sheer size of the game.

Players could explore the Capital Wasteland in all its decimated majesty, as well as deciding early on whether or not to destroy one of the largest in-game settlement for a laugh, not to mention being incredibly disturbed the first time they spoke to a ghoul up close.

Fallout 3's replayability lies in its sheer size as well as its expertly crafted world, which is filled to the brim with secrets, easter eggs and side quests for a range of factions that ensure that players will keep returning for more.

There's also the game's perk system, which allows players to choose perks to suit their chosen class or gameplay style, all of which would vary with the way you chose to treat the Wasteland and its inhabitants. Fallout 3 offered so many possibilities for not only gameplay but for nuanced changes to the way in which the story unfolds that it will always remain replayable to fans of the series.

For many it was a gateway into the franchise, which has only gone from strength to strength since.