The site contains 16 games with different levels of question types, ranging from easy to hard. The questions are about plain Ruby or Rails, with code samples, and the answers are offered as simple Yes/No or 1, 2, 3, or the hardest set with A, B, C, D answers.
Every user can sign in with a password/email or with their Gmail account. There is also a special feature where a user who finishes one game can invite a friend by email to play the same set of questions. At the end, they can compare their game results and their knowledge.
