Is Centumth free to play?

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

How often does Centumth reset?

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

On centumth.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 49 plays

Every topic has a hidden Top 100, and the aim is to land as near number 100 as you can.

Centumth

Misc

One topic, one hidden Top 100, and the aim is to land near number 100 rather than number 1.

The obvious picks rank low and score low. A deep cut near #100 is worth real points
A guess's rank is its points, and anything not on the list scores zero
Five guesses
A new topic drops every midnight

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

If you play Centumth, the closest things to it in the catalogue are AITA Guesser, Face Guessr and Minigolfle. They sit in the same misc category. See the full list of alternatives.