Okay, trust me, I don't want to write this any more than you want to read it, so I'm going to keep this as brief as possible:

Dekiruka is as simple as I could make it. A temporary account ID is created and tied to your browser and is saved server-side ONLY when you start a quiz or type an answer in, and only for the purposes of being able to continue a quiz or create an account with your saved answers later on. Nothing besides this randomly-generated account ID is used for identification -- I don't touch IP addresses or anything location-based at all so rest assured.

Your custom quiz info, answer, the amount of time it takes for you to answer, and the time at which you make your answer is the only info saved. Oh, and if you link an account, the identifier from that account is then used and replaces the temporary account identifier.

If you choose to link an account your info will be featured in the (public) leaderboard and your username will be shown if you're in the top 10 users on the site. Your answer info is also used anonymously in averages on the stats page. If you'd like your answer data anonymized please send a request.