Every Electronic Entertainment Expo delivers its share of surprises, but this year's seemed to top every other. Here are five big reveals from E3 in Los Angeles that had gamers cheering or gasping.

1. FALLOUT SHELTER DROPS THE BOMB

Seeing gameplay for Doom and Fallout 4 was a thrill, but the real bombshell was when Bethesda Game Studios announced Fallout Shelter, a mobile game where players get to build and manage their own underground community and also try to keep the residents happy. The free-to-play game is nothing short of addictive.

2. XBOX ONE LOOKS BACKWARD TO COMPATIBILITY

Xbox 360 owners who are still on the fence about upgrading got some heartening news with the announcement that the Xbox One will soon support backward compatibility. It doesn't seem like the entire Xbox 360 library will be compatible, but Microsoft promised at least 100 games will be available by the holiday season, including retail discs. The games will be fully compatible with Xbox One features, including cross-platform play with those still playing with a 360, along with Windows 10 features like game DVR and (presumably) streaming.

3. FINAL FANTASY 7 BEING REMADE

Fans who have been demanding a remake of Final Fantasy 7, one of the most popular games in the series, finally got their wish. A short teaser trailer indicated that the game will be remade for the PlayStation 4 using high-end 3-D graphics. The bad news: the remake's anticipated launch isn't until 2017.

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4. A NEW 'SOUTH PARK' PLAYGROUND

The Ubisoft press conference revealed several great surprises, but the biggest was the announcement of South Park: The Fractured but Whole, a sequel to The Stick of Truth. It looks like fans will be casting aside the swords and sorcery fantasy in exchange for a superhero theme.

5. THE LAST GUARDIAN RETURNS

It seems rumors of The Last Guardian's demise were exaggerated, because the game made a huge showing at the Sony press event, along with a lengthy look at its early gameplay. Despite suffering from numerous delays and complications, the game, due to come out next year, looks great.