It's very challenging and very cheap on steam (2.99 Euro), so I recommend it to everyone.
There are quite a few different difficulty levels, and the first one that you can use is "hard" xD, which kind of gives you an idea that this game can be pretty hard.
If you are young and in your teenage then I bet you will have it easier, since your reflexes will be a lot faster then anyone older ^^
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http://superhexagon.com/
http://store.steampowered.com/app/221640/