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As for the launch time well, that's a little complicated. The ideal is that the version that is free to play of Lost Ark Gold will launch via Steam on February 11, at the following dates:
9 AM PST
12 midnight EST
5 PM GMT
6 PM CET
The reason I'm using "ideally" with regard to Lost Ark's free-to-play launch time is because we've seen players struggle to get into Lost Ark in time for the exact date of its Early Access debut.
Between crowded servers and number of technical issues players were waiting at the very least for a bit longer to actually start playing the MMO. As the game is being opened up to a much larger players on Friday, it's likely that players will have to deal with similar issues on servers when it opens.
What are the other platforms? The developer Smilegate in conjunction with Los Ark's Western publisher Amazon Games haven't shared any plans to make the game available on Xbox, PlayStation, Nintendo Switch along with an Epic Games store, but considering that the game does offer partial controller support via Steam and Steam, it's not unreasonable to imagine that it may in the future be offered to a wider audience.
Anyone who hopes to jump into Lost Ark Power leveling when it goes free-to-play on the Friday, should think about starting it as quickly as possible. Otherwise, there's an extremely possibility that you'll have to wait a while to jump in.