internet PUZZLE [CS] Czech

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Choose a puzzle:

Type: Misc Difficulty: Hard Solved: 10 times
Type: Mathematics Difficulty: Medium Solved: 24 times
Type: Misc Difficulty: Unbeatable Solved: 3 times

Important:

English isn't my mother tongue, so please pardon my mistakes.

Puzzle C was solved. Well done!

Author of this puzzle is Petr 'Noobos' Heinz from Czech republic.
In case of any problem, question or suggestion, please feel free to contact me at noobos@gmail.com.
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