Is Reaction free to play?

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

How often does Reaction 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 Misc, alongside the other daily games of that kind in the catalogue.

Misc New

Test your reaction time in a shared daily round: wait for the screen to turn green, then click as quickly as you can.

Reaction

Misc

Is Reaction free to play?: Yes. Reaction runs in a browser at no cost, with nothing to install and no purchase to make.
How often does Reaction 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 Reaction support?: English.
Where does Reaction run?: On bludle.com, and you can play it inside this page without leaving Alldle.
What kind of game is Reaction?: It sits in Misc, alongside the other daily games of that kind in the catalogue.

If you play Reaction, the closest things to it in the catalogue are Colour Match, Arc Shift and Borrowed Letters. They sit in the same misc category. Colour Match is from the same universe, Bludle. See the full list of alternatives.