Context: OptiFine was a big part of Minecraft modding for a long time and has been causing errors with mods this entire time, it's closed source nature making it especially hard to work with as a mod developer.
For that reason, a lot of alternatives have been created.
But usually they only replicate one specific feature of OptiFine, meaning the user has to install a lot of mods and configure them by searching for the specific mod in ModMenu.

The first problem is relatively easy to solve, by either downloading a modpack such as Fabulously Optimized or using Lambda's fantastic list of alternative mods
Puzzle was created to solve the latter by providing a united config for OptiFine replacement mods with built-in support for the most relevant alternatives and an API for other mods to take advantage of.
Due to many OptiFine features still having no replacement mod, Puzzle also adds certain OptiFine features on it's own, like resourcepack-provided splash screens
We also offer some new, innovative features to resourcepack developers, such as unlocked rotation values and bigger size for JSON-models.
The configuration screen can be found in the vanilla options screen, as well as ModMenu. ‎

Currently, there is included support for the following mods:

Visit the new wiki to get started with using Puzzle for your own resourcepack!