Guides
Guides & Explainers
Plain-language walkthroughs — the Code Mode mechanics behind the viral calculator, and the math inside our tools. This section grows monthly; the fastest way to get a topic written is to ask.
Games
CalcSolver Code Mode: How to Enter It & Unlock the Games List
The complete walkthrough: the switch, the 0000-vs-000 question, all 130 game codes, the server switch, and a live Code Mode to try.
Games
The Full Hidden Games List (130+ Games, Every Code)
Every entry in the code-mode list with its 4-digit code — searchable, grouped, and verified October 2026.
Tools
Tipping norms: restaurants, delivery, salons, taxis & abroad
The tip calculator plus the percentage norms it's built on — including the round-up custom in Germany.
Tools
Concrete math: yards, bag specs, sonotubes & post holes
How the volume formulas work and when bags beat a ready-mix truck.
Tools
Time cards: lunch breaks, overtime per week, military time
Why payroll counts overtime weekly, how decimal hours work, and how overnight shifts are handled.