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The co-founder for Cyberpunk 2077's developer has released a new video explaining what went wrong with the game.
CD Projekt's Marcin Iwiński admitted they "underestimated the task" of adapting the game for consoles like the PS4 and Xbox One.
Gamers reported glitches including choppy frame rates and screen tearing.
Marcin says he's "deeply sorry for this and this video is me publicly owning up".
The game was arguably the most anticipated release of 2020 but the launch just before Christmas was a disaster.
The problems led to Sony and Microsoft removing the game from online stores and gamers were offered refunds.
Cyberpunk 2077 is a set in the fictional Night City – a dystopian future where pollution and crime are rampant and social inequality is the norm.
In the video, Marcin explains issues originated from Cyperpunk's "huge" scope, particularly the high number "of custom objects, interacting systems, and mechanics", making it a complex game.
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As this was "condensed in one big city" rather than spread over a bigger space – it needed greater hardware capability.
So despite working well for high-end PCs, it couldn't be adjusted to older generation consoles such as the PS4 and Xbox One, making in-game streaming difficult.
"We hit the ground running on PC. While not perfect, it's a version of Cyberpunk we're very proud of."
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Marcin adds that testing did not "show a big part of the issues" that gamers experienced.
"As we got closer to the final release, we saw significant improvements each and every day."
He also blames the coronavirus pandemic for creating issues for CD Projekt as they tried to improve performance after launch.
"A lot of the dynamics we normally take for granted got lost over video calls or email. And we took that hit too."