Urging fans to plunge into a virtual high-res surround sound universe of extraordinary games, Google hopes its cloud-based Stadia platform will take the world by storm on its November launch.

The US digital behemoth unveiled details of its nascent streaming video platform at this week's Gamescom trade fair in Cologne in the hope it can gain massive traction among hardcore gamers to zap past other providers of existing gaming fare.

Gamescom, styling itself the biggest event in the European gaming industry, is a sizeable window on the state of play in a mushrooming market worth an estimated $135 billion globally last year, according to analysts -- with mobile platforms accounting for about half.

Stadia, details on which first publicly emerged in June at E3, the world's premier event for computer and video games, offers as its USP the chance for users to play their favourite game on a range of platforms in high resolution quality on different media from smart TV to console or smart phone.

That presages something of a gaming revolution.

"People have been talking about cloud gaming for ten years -- we are on the third generation of actors. The signals have not yet turned green but Google has got solid enough guts to try it. We've never been so close," says Laurent Michaud, director of studies at French digital market consultancy Idate.

Gamescom represents a chance for some hands-on experience and the brand's huge logo, plus its battalion of hostesses on its stand are helping to pull in the curious as they compare relative attractions with rivals led by Sony's PlayStation and Microsoft's Xbox.

Google chief executive Sundar Pichai explained at E3 in Los Angeles the idea is "to build a game platform for everyone" following an initial rollout in 14 countries using a subscription model after an initial bundled hardware purchase.

Some games will be free and others will require payment.

Even so, the Gamescom evidence after Monday's opening suggested interest had yet to hit the heights of neighbouring stands Nintendo or Konami -- the latter being the developer of Pro Evolution Soccer's latest gambit PES 2020.

"I find their concept interesting but I have doubts as to their capacity to guarantee good connectivity," commented stand visitor Rishil Kuta, 22. A keen console user he said he would nevertheless be "ready to pay" a premium for a "stable" product.

Not sharing that opinion was Steven Mertes, 28, who said he did not see himself as ready to log off from his PC or close his console "which propose games of much better quality."

"I have always been used to playing on a computer -- it's much more comfortable."

Whichever way the cloud gaming cards fall the race is on to hook players, especially the hardcore ones, for next-generation gameplay.

Technical constraints

"The most difficult gamers to convince will be the 'hardcore gamers'. They may not be as numerous as occasional players but they are the ones who count. If they don't go to a platform things could be difficult," predicts Michaud.

The hardcore brigade tend to be willing to pay out for the rig and content they want -- but are often very attached to their favoured support environment, be it console or PC-based.

Beyond the task of converting gamers to Stadia, Google must address various technical obstacles that go with the territory of developing cloud gaming.

Although Stadia is promising 4K high resolution at 60 frames per second for minimal time lag, it remains to be seen how the platform can persuade players who may not have suitably adapted screens along with fibre optic broadband or 4G connections to subscribe.

"We have a small doubt on the development of cloud gaming," says Wandrille Pruvot, CEO of Xtra Life, a cloud-based apps manager for Apple. "The challenge will notably be technical as the better the resolution the greater the need for a quality internet network.

"The games we are working on are simpler, more based on gameplay quality and that requires less bandwidth for the graphics," says Pruvot. "One mustn't forget that video games are not just about big productions!"

The bet for cloud gaming is thus to push independent, if not always very visible titles -- a means for Google and rival producers to position themselves as a 'Netflix for gaming' by providing original content.

"This type of platform can free the creative aspect from technical constraints ," says Fanny Renard, a community manager with independent indie game developer Goblinz.

"A form of Netflix could be a production aid for the smallest independent studios. But this will then raise the question of remuneration, which could be complicated."

Overall, though, just as consoles did not kill off PC gaming, cloud gaming could essentially offer an extra strand of choice for fans of video games.

"There will always be a place for the PC or the console," forecast Renard. "Gamers remain more at ease with different platforms. What they want is to be able to choose which game to play and how."