You can create and save worlds directly to your browser's local storage.

If you are looking for a way to play Minecraft at school or on a device where you can't install software, Eaglercraft

is essentially a real version of Minecraft that runs entirely in your browser using Java-to-JavaScript technology, making it the ultimate "unblocked" game for chromebooks. Eaglercraft is the Top Choice for Unblocked Gaming Most browser games are simple 2D puzzles, but Eaglercraft is the full experience. You get: Multiplayer Support: You can join dedicated Eaglercraft servers and play with others in real-time.

Realistically? Thousands of people play it daily. Mojang/Microsoft has taken down a few high‑profile repos but never sued an individual player. For a student wanting to learn redstone during a free period, it’s widely considered a low‑risk, harmless fan project.

uses the actual Minecraft engine assets. You get the real physics, crafting recipes, and gameplay loops.