: Recent updates have reportedly added "Riptide" mechanics and other modern gameplay elements to the client. Performance & Gameplay Optimization
Tuff Client is recognized for its optimization and utility mods that are typically reserved for standalone Java clients: Performance Optimization
Among the most intriguing and enduring of these was the Tuff Client for version 1.12.2. While mainstream Minecraft players were celebrating the Caves & Cliffs update, a dedicated underground community was cementing its legacy in the world of JavaScript-to-Bytecode conversion.
The term "Tuff" in this context is not a typo of "Tough." It is a branding used by specific community developers who forked (copied and modified) the original Eaglercraft source code.
: You must use ViaVersion , ViaBackwards , and ViaRewind to handle version differences, along with EaglerXBungee on a BungeeCord proxy to allow web-based Eaglercraft clients to connect.