Nibble Puzzle

Nibble Puzzle is short prototype made in Ren'py (using python).
In this variation of "Bulls and cows" you are given 16 bits, which are 4 nibble shuffled between each other. Your goal is to guess right combination of these 16 bits with "Bulls and cows" answers given to you according to result of four hexadecimal numbers. This is very simple and linear puzzle, but it is a bit harder than your classic "Bulls and cows" and also trains your ability to convert numbers from binary to hexadecimal and vice verca.