CalcSolver.si is an independent, single-purpose site: a free online calculator you can trust, a handful of tools people actually need, and clear documentation of the Code Mode phenomenon — the viral calculator that hides 130+ games behind its keypad.
What we make
- A real calculator. The homepage calculator supports keyboard input and — like the calculator that made this corner of the internet famous — a Code Mode switch. Ours opens a small arcade (2048, Snake, Minesweeper) that is written into this site itself: no third-party frames, no mystery hosts.
- Utility calculators. Tip, concrete and time card calculators built for daily use, each with the math and the rules-of-thumb explained in plain language.
- Reference guides. Every game in the hidden list, with the 4-digit code that opens it — verified live, dated, and maintained. When a game goes dark or the list changes, we re-check and update.
Principles
- Everything runs in your browser. Calculations never touch a server. No accounts, no analytics on your inputs, no saving.
- No rented games posing as ours. We document the viral games list; we don't host or embed it. The games on this site are the three we wrote ourselves.
- Dated, verifiable claims. The games list was verified on October 6, 2026. If something changed since, tell us and it gets re-checked.
Independence
CalcSolver.si is not affiliated with, endorsed by, or operated by calcsolver.net, calcsolver.org, calcsolver.com, solvecalc.net or any other similarly-named site. Game titles mentioned in our guides belong to their respective owners; this site hosts no third-party game files and displays no game artwork or logos.