By Jim Reed
Newsbeat technology reporter
Eddie and Jason road test the much-anticipated new arrival
After months of rumour, speculation and delay, Grand Theft Auto IV has finally hit the shelves.
Thousands of gamers queued overnight to be the first to get their hands on a copy.
Sales are expected to top £300m this year, making it one of the most valuable entertainment properties of all time.
GTA IV is the latest and most ambitious project yet from developers Rockstar.
One hundred and fifty programmers in Edinburgh and Leeds have spent the last four years working on the project.
The first reviews have been positive.
According to Metacritic.com, which combines all the ratings from magazines and websites, it has a perfect average score of 100%.
But Metacritic users are not quite as convinced, giving the game an average rating of 8.3 out of 10.
So should you believe the hype? We asked Radio 1 listeners Jason and Eddie for their early thoughts on the game.
"It took about an hour or so to adjust as I'm just so used to the old GTAs. To begin with, I wasn't that impressed with the graphics.
There are lot of glitches like characters getting caught on doors and cars vanishing. But after seeing more and how it works together with the new physics engine, I am convinced.
Rockstar has done an amazing job on the soundtrack as well.
My only complaint is with the storyline. The game is slow to start. We finished six missions and nothing had really happened.
The multiplayer options are amazing. With 16 players in a deathmatch, and 8 on each team, you have this great feeling that you belong in a little gang.
GTA III blew everything else out of the water when it was released. There was nothing else on that level.
GTA IV hasn't really done that. It has built strongly on the game's foundations but it hasn't rewritten the rulebook.
For me, it hasn't met my expectations. But they were so high, it never could have. It's still an amazing game.
Either way, I've cancelled all appointments for the next three months. I'm only going to let people down otherwise."
"Rockstar has to slowly work you into the game because there are just so many hours of play in there.
I don't think we can really comment on single player properly after one night. There is so much more to come.
There are loads of different multiplayer game types like Cops and Crooks and Team Deathmatch.
Playing the game and talking to real people makes a big difference. It's a lawless city and you really can do what you want.
For me, it has lived up to expectations.
I didn't read that many previews online before it came out so I wasn't completely obsessed with it.
It's what I thought it was going to be. It's GTA but even better."