Is Second Sight free to play?

Yes. Second Sight runs in a browser at no cost, with nothing to install and no purchase to make.

How often does Second Sight reset?

Once a day. Everybody gets the same puzzle, and a new one replaces it when the game's day rolls over.

On bludle.com, and you can play it inside this page without leaving Alldle.

It sits in Colors, alongside the other daily games of that kind in the catalogue.

Colors New

Remember two fleeting colours and identify whether the second became brighter, darker or shifted in hue.

Second Sight

Colors

Is Second Sight free to play?: Yes. Second Sight runs in a browser at no cost, with nothing to install and no purchase to make.
How often does Second Sight reset?: Once a day. Everybody gets the same puzzle, and a new one replaces it when the game's day rolls over.
What languages does Second Sight support?: English.
Where does Second Sight run?: On bludle.com, and you can play it inside this page without leaving Alldle.
What kind of game is Second Sight?: It sits in Colors, alongside the other daily games of that kind in the catalogue.

If you play Second Sight, the closest things to it in the catalogue are ColorGuesser, Prism and Colordle. They sit in the same colors category. See the full list of alternatives.