Might want to update the Steam "key features" section where it says:
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Free to Play!
Spiral Knights is free to play, no subscription is required to enjoy everything the game has to offer.
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Previously this was a true statement, but with the release of Operation Crimson Hammer, it does not appear to be the case any longer. Maybe Operation Crimson Hammer can be traded, but trading will not be possible by every F2P player.
Thanks!
Yeah, the tagline needs to be changed, as it is now an outright fabrication :)