Getting Defly.io Running When Your Network Blocks It
Defly.io is a multiplayer tower defense game that runs entirely in the browser. You build turrets, manage resources, and fight other players in real time. No download required. It works fine on open networks. The problem starts the moment you step into a school lab, a workplace Wi-Fi zone, or any network that has an active content filter. The most straightforward path is through a proxy or mirror site. These services sit between your browser and the actual Defly.io servers, relaying traffic in a way that the local firewall doesn't recognize as game traffic. There are dozens of these sites floating around. Most of them die within a few weeks when the filter makers update their blocklists. The second option is a VPN. You pay maybe $10 a month, install the client, pick a server, and suddenly your traffic isn't coming from the school network anymore. It comes from wherever that VPN server is located. This works reliably. The downside is the cost, and some organizations actively block known VPN IP ranges.
The third option, which I occasionally use when both of the above fail, is a self-hosted proxy. If you have access to a cheap VPS—something running Ubuntu for about $4 a month—you can spin up a simple proxy script and point your browser at it. This takes maybe 15 minutes if you know what you're doing. The upside is that no one else is sharing that tunnel, so you don't get throttled by other users hogging bandwidth. Here is the thing most guides leave out. The reason these unblocked versions exist isn't because the game is special. It's because most network filters block by domain name, not by content analysis. They see .io and they flag it. They see a websocket connection and they flag it. A proxy hides both of those things. That's the entire mechanism. I had a specific issue last semester where my university blocked every major proxy site by IP, not just by domain. The usual suspects were all gone. What actually worked was routing through a cloudflareworker instance I had set up months ago for something else entirely. I pointed the worker at Defly.io's endpoints and used it as a transparent proxy. It held up for about three weeks before the network team noticed the unusual websocket traffic pattern and added it to their inspection rules. You learn quickly that nothing lasts forever on these things.
Performance on free proxy sites is hit or miss. I've seen ping spikes from 40ms to 400ms depending on how many people are using the same proxy node. If you are trying to play competitively and someone is mining crypto on the same proxy server, your game will lag regardless of your actual connection speed. This happens more often than you would think. There are a few practical risks to be aware of. Some proxy sites modify the game files before passing them to your browser. I noticed this once when a mirror version of Defly.io was displaying injected ads directly inside the game canvas, overlaying the turret placement UI. The workaround was checking the WebSocket connection endpoint. If it isn't connecting to the official Defly.io servers, you are playing a modified version. I switched back to the main site through a VPN immediately. Another issue is account data. If you log into your Defly.io account through an untrusted proxy, your session cookie passes through that proxy operator's server. I don't recommend doing this with an account that has real progress or linked data. Use a throwaway account if you must play through a proxy. I learned that one the hard way after a proxy site went offline and my session token got logged somewhere I couldn't find.
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The realistic expectation is that free unblocked methods will degrade over time. Proxy sites get blocked. VPNs get detected. Self-hosted solutions require maintenance. The only method that stays stable long term is having a personal VPN and rotating providers when one gets blocked. It costs money. It works. Nothing else comes close to that reliability.
