Click "Multiplayer" > "Add Server." Use an anarchy server that still runs 1.8.8 protocol. Do not use this client on competitive, fair-play servers; you will be banned instantly.
Once in-game, press Right Shift (most common keybind for Tuff). A rainbow or dark-themed click-gui should appear. Toggle "Flight" or "X-Ray" to test. The Ethical Debate: Is Tuff Client "Hacking"? It is important to distinguish between "cheating" and "hacking." Tuff Client does not break into servers or steal data; it manipulates the client-side rendering and input packets. tuff client eaglercraft link 2021
However, using Tuff Client on public Eaglercraft servers is almost universally against the rules. In 2021, server administrators waged a war against Tuff users. By 2024, most servers have patched the 2021 exploits. Click "Multiplayer" > "Add Server
Once the page loads, you will see a modified Eaglercraft title screen. It should say "Tuff Client v1.0" or similar in the corner. A rainbow or dark-themed click-gui should appear
Search GitHub repositories for forks named "Eaglercraft-Tuff" or "Tuff-Client-Archive." Look for a commit date between March and December 2021.