Puzzles, riddles and enigmas are words interchangeably used to refer to a type of web-based challenge dating back to 1999. The Internet has been used as a medium to create a familiar puzzle system using limited web tools.

Forums (most notably Nordinho) and IRC chats were used to collaborate and share progress.

Standard layout: the player is presented with a webpage containing a puzzle and must solve it to proceed to the next webpage (level). Levels consist of finding strings to either input into the URL or into an authentication form (known as a "UN/PW"). In a puzzle, the solver is expected to put pieces together in a logical way, in order to arrive at the correct or fun solution of the puzzle. There are different genres of puzzles, such as number puzzles, logic puzzles and ciphers. Some levels require image editing, browsing the Internet to find information or searching through the webpage's source code.

We aim to offer players all the necessary resources by centralizing solving tools, providing a comprehensive list of all known puzzles and progress tracking.