The most reliable way to play without downloading anything is through cloud gaming. Sites like Easyfun.gg allow you to log in with your Supercell ID and pick up right where you left off. No installation required; works on most browsers.
However, the unblocked world carries significant risks. clash royle unblocked
If you're eager to play Clash Royale but find it blocked on your network, here are some strategies to consider: The most reliable way to play without downloading