Guild Wars: Hard Mode

Does exactly what it says on the tin. No, really.

Guild Wars: Hard Mode

PvE Hard Mode is about to be released. Check out the official page for the details.

Edit: one non-obvious point they didn't mention - to get access to Hard Mode for a PvE campaign, you have to log in with a character who's beaten the campaign. After that, all your characters can play in Hard Mode for that campaign.