Hungarian is regarded complicated, but in fact it is quite regular and even simple in some aspects - there is no grammatical gender and modern Hungarian has only three temporal forms, of which only one is a combined form (future).
Among the unusual things in Hungarian are agglutination (Turkish has it too and even Esperanto) and vowel harmony (mostly found in Turkic and Uralic languages).
Agglutination example: House is ház, apple is alma. Inside the house is ház[ban], inside the apple, almá[ban]. Inside [my] house is ház[am][ban], inside [my] apple almá[m][ban]. And so forth. It's kind of like postfix notation.