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1. Added levels of difficulty, which increase depending on the number of tasks solved.
2. The news feed has been updated, now it is informational.
3. Added terms of use. (now only in Russian)
4. Fixed minor bugs.
5. Added tasks with degrees
6. Added error handler.
7. The hint system has been slightly reworked.
(1 hint = 1 score + 1 hints) At the beginning you have 3.0 hints points and 0 score points available. For each correct answer, you get: +1 Score point +0.5 hint points
