How I Built a Fast, Multilingual Crossword & Sudoku Platform (crossword.by)

For the past months I’ve been working on a side‑project that started as a tiny experiment and slowly grew into something much bigger — a clean, fast and multilingual platform for crosswords, sudoku and other logic puzzles: crossword.by. I didn’t plan to “build a puzzle platform”. I just wanted a simple place to solve crosswords without ads, pop‑ups, trackers or slow scripts. But the deeper I went, the more interesting the challenge became. Here’s the story, the tech behind it, and what I learned along the way. Why build another puzzle website? Most puzzle websites fall into one of two categories: overloaded with ads outdated and slow limited to one language not mobile‑friendly or all of the above I wanted something different: instant loading clean UI works on any device supports multiple languages no registration no distractions Basically: a quiet place to think. The multilingual challenge Supporting multiple languages (EN, DE, FR, ES, UK, RU and more) turned out to be one of the most