As a 1 time order, I have a very interesting task. I had to make a personal web-quest with unique mechanics and logic. All of the pages as crosswords, sliders, tags, hide and seek, charades, puzzles, and so on were created from the bottom by using only HTML, CSS, and JavaScript.
Each big project starts with the tiny steps.
The project was adapted to be unavailable to pass on the mobile devices by verifying the screen size of the device. After all the website was located at the temporary hosting (rented for the half of the year).