Game · Deduction
Mastermind
Guess the secret 4-peg color code. Black peg = right color in right spot. White peg = right color, wrong spot.
Pick a color, then click a peg in the active row to place it.
Guess the secret 4-peg color code. Black peg = right color in right spot. White peg = right color, wrong spot.
Pick a color, then click a peg in the active row to place it.
Mastermind delivers classic browser games with a 90s arcade aesthetic, built for anyone needing a quick break — students, remote workers, gamers reminiscing about 90s arcades, parents teaching kids about games. It is part of the Toolvana family — a curated collection of 190+ free, privacy-respecting browser tools built and maintained by Aravind Labs. The aim is simple: replace expensive SaaS subscriptions and surveillance-heavy web tools with something fast, clean, and trustworthy.
Crack the 4-peg color code in 10 tries. Logic deduction game from the 70s/80s. Under the hood, the tool is powered by Canvas 2D rendering, Web Audio for SFX, and pure JavaScript game logic. The result is something that feels like a native desktop app: instant feedback, no loading spinners after the first paint, and full control over your data.
The web is full of "free" tools that ransom your file in exchange for an email address, plant trackers on your browser, or sell your data to "advertising partners" buried in a 40-page privacy policy. Mastermind takes the opposite stance: No accounts, no leaderboards, no tracking. Play, refresh, repeat. Your high score lives only in this browser session.
For users who handle anything sensitive — legal contracts, medical PDFs, ID documents, financial spreadsheets, private journals — this difference is not academic. Once a file leaves your device, you have no idea where it goes, who reads it, how long it is kept, or what happens during a data breach. With Mastermind, the answer is permanent: nothing leaves, nothing to leak.
When you open the page, your browser downloads a small JavaScript bundle that contains the tool logic. Once loaded, every action — file processing, computation, rendering — happens locally using your CPU and GPU. The browser exposes capabilities like Canvas 2D, Web Audio, Web Crypto, WebAssembly, and WebCodecs that, combined, are enough to do what desktop apps used to require.
This architecture has three implications: (1) privacy by design, since there is nowhere for data to leak; (2) speed, since there is no network round-trip; (3) offline capability, since once loaded, the tool keeps working without internet. The trade-off is that very heavy compute (training AI models, transcoding multi-hour videos) is still better-suited to native software — though even there, browser capabilities are catching up fast.
Mastermind helps with a 5-minute mental palate-cleanser between deep work sessions, kept on a pinned tab.
Mastermind helps with showing colleagues a quick FLAMES result, playing tic-tac-toe with a friend across the table.
Mastermind helps with parents introducing kids to chess, hangman, Snake — classic games without ads or in-app purchases.
Mastermind helps with a tab open in the background for those moments when the agenda runs long.
Mastermind helps with reliving 2048, Snake, the classic Nokia experience, but on a modern browser.
Yes — Toolvana is free with no signup, no trial expiration, and no hidden limits. The site is supported by lightweight, non-intrusive ads (and donations from grateful users). You will never be asked to upgrade for a premium tier or hit a "5 uses left" wall.
No accounts, no leaderboards, no tracking. Play, refresh, repeat. Your high score lives only in this browser session. You can verify this yourself by opening DevTools → Network tab and watching for outbound requests while you use the tool.
After the first load, the JavaScript and assets are cached by your browser. Most operations work offline — only tools that explicitly call out external AI or API services require a connection. The browser registers a service worker so the page loads without a network round-trip on repeat visits.
Yes. The interface is fully responsive and supports touch input. We test on iOS Safari, Chrome on Android, and major desktop browsers (Chrome, Firefox, Safari, Edge) — last verified in May 2026.
Yes. Toolvana tools are usable for personal, educational, and commercial work. Output (generated images, processed documents, etc.) is owned by you under the licenses of the underlying libraries. Pollinations-generated images carry no commercial restrictions for typical usage.
Most paid tools (Adobe Acrobat, Canva Pro, SmallPDF Premium, Grammarly Premium) charge ₹500-3000/month for similar functionality. Toolvana provides the same core capabilities free, with one trade-off: heavy compute (AI image generation) is rate-limited at peak times. For ~95% of day-to-day use, the experience is identical or better.
Because everything runs in your browser, there is no upload time, no queue, no server cold-start. A 5 MB file that would take 8 seconds to upload to a competitor finishes processing here in under 2 seconds — limited only by your CPU.
Browser-only tools have no recovery state — if the tab crashes during a long operation, you start over. We mitigate this by chunking large operations and reporting progress, so you know how far along you are. For mission-critical tasks, always keep a backup of the source file.
Toolvana has 190+ tools across categories. Some related ones you might find useful:
Toolvana is a free, ad-supported, privacy-first multi-tool web app built and maintained by Aravind Labs. The site has no paid tier, no enterprise upsell, and no premium gating — every tool is fully functional for every visitor. Light ads keep the lights on; that is it. If a tool ever feels broken, slow, or sketchy, the source is open in your browser's DevTools — and you can drop a note via the contact page on the parent site.
Last updated: May 2026. Tools are continuously added based on what real users ask for. If you have a request, open an issue on the AravindLabs site or reach out via the contact page.