E3 has officially had its first day open to the public, and it did not disappoint, it had incredible booths showcasing the latest content from games like Fortnite, Pokémon and Marvel Avengers.
Nintendo also announced all their upcoming releases, and fans of the gamemaker were delighted.
Not only did they show previews of the new Pokémon Sword and Shield games for the Nintendo Switch, they also announced a second instalment of their award-winning Legend of Zelda: Breath of the Wild.
However, fans of Animal Crossing might have been sad to find out that the game that they were expecting to be released this year on Switch will now be delayed until March 2020.
The new Animal Crossing game will see players crafting tools, cleaning up after their neighbours and making their island home look as pretty as possible.
More game previews were shown including another Zelda game called Link's Awakening and the Super Mario Maker 2.
There were more surprises in store from Nintendo. A brand new Luigi's Mansion game featuring a bizarre new character - Gooigi.
Gooigi is a gooey version of Luigi who helps him in the haunted mansion adventure game. No, we're not making this up.
There is also another Marvel Avengers game coming, one to rival Square Enix's game that was announced earlier this week.
It's called Marvel Ultimate Alliance 3: The Black Order.
Fans of Nintendo were also pleased to see the introduction of familiar faces Banjo and Kazooie to the Super Mario Smash Bro. game. These characters date from more than 20 years ago!
However, there was some disappointment with the new Pokémon Sword and Shield reveal, as the developers revealed that the full 800 Pokémon will not be available in the new games.
Basically, you won't be able to play with all the Pokémon you collected in the Pokémon Let's Go Eevee and Pikachu games in the new Sword and Shield games, though you can still transfer some of them over.
On Monday night, while many of us in the UK were asleep, game makers Ubisoft and Square Enix were announcing their next big releases to an audience at the Los Angeles Convention Centre in the US.
Square Enix unveiled a first look at their Marvel Avengers action-adventure game, launching on PS4, Xbox One, PC and Stadia next year.
Ubisoft announced Just Dance 2020's release date for November. It's a game which teaches you dance routines to different songs, and revealed that it includes music from Ariana Grande and BLACKPINK.
The Square Enix and Ubisoft announcements got everyone talking. Fans of Marvel were excited for the reveal of the Avengers action-adventure game.
But some were concerned that not much gameplay was shown. That means that only video clips of the game was shown, not actual footage of the game being played.
Just Dance also surprised its audience, by revealing that they will also be releasing the game on the Wii console along with the Nintendo Switch, PS4 and XBox One.
If you remember the Wii, congratulations, because many of you reading weren't even born when it was first created!
On Tuesday, Nintendo - makers of Mario, Pokemon and Zelda games - will be making their announcements at 5pm UK time. So let's wait and see what they will bring.
On Sunday, Microsoft made a big announcement - a new console is coming, which is due to go on sale before the end of 2020.
The games maker promised it would be the "biggest leap" over previous consoles.
Called Project Scarlett, Microsoft said the new device would be four times more powerful than Xbox One X.
Along with this, it announced some brand new games, including Ori and the Will of the Wisps, Minecraft Dungeons and Star Wars Jedi: Fallen Order.
Xbox boss Phil Spencer strongly hinted that the new console was designed to take advantage of the latest capabilities of the internet, but he did not give any details about this.
The announcement of a new console is exciting for many fans of Xbox.
While Microsoft did not reveal how much the console would cost or what it would look like, it showed 13 minutes of footage to prove what the new machine could do.
It promised that it will be able to display 8K graphics (that's four times more resolution than an HD television), play at 120 frames per second (most screens in the UK play at 25 or 50 frames per second) and that a new solid state drive that would help to reduce how long it takes for a game to load.
Many people are excited to see what this new technology will look like, but the console will not be released until Christmas next year.
Keanu Reeves - who will be voicing Duke Caboom in the next Toy Story instalment - was a surprise guest for a brand new Microsoft game.
He will be featured in the game which takes place in a futuristic dystopia.
One fan was overwhelmed to see the actor on stage, shouting: "You're breathtaking."
Keanu returned the compliment.
Big players like Sony Playstation and EA have pulled out this year, saying that they will find other ways of promoting new products to their audience.
Some think that E3 conferences are a bit old-fashioned now that there are platforms like Twitch and YouTube on which to announce new releases.
But there seems to be plenty of E3 fans who disagree.
There are no more big announcements expected from the E3 convention, but the event will keep going until Thursday so there might still be some surprise reveals?
Watch this space!