Is Solvent free to play?

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

How often does Solvent reset?

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

On solventgames.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

A free daily puzzle collection with games such as Sudoku, Nonogram, Mini Crossword, Word Search, Gridlock, Riddles and Quartets.

Solvent

Misc

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

If you play Solvent, 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.