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Error 400 is a website, that acts as an interactive source of information about Web-Usability. You can increase the Usability of the site itself step by step, by finding and pointing out built in mistakes, addressing various important topics.

The website is based on a level system, where you have to find a certain amount of mistakes on one subpage, to unlock the next one. Thematically the mistakes in one level belong together and the texts of the following level address this topic, while you have to find new mistakes there, relating to another topic.

The topics reach from Readability, Design Principles, Contrasts and Responsive Design all the way to the Use of Imagery, Clickable Elements and Accessibility.

Once you went through all levels, you are left with the optimized pages and can browse them to read about all topics in detail.

This website aims to spark interest in Usability and User Experience, trying to visualize their impact and acting as a first touchpoint to the topic.