PasswordHacking: arcade logical jigsaw

PasswordHacking is a logical game for one or two players. Your task is to guess four numbers which is proposed by computer.
The computer propose a four-digit number for a particular principle:
- The numbers must not be repeated;
- You can use the numbers from 0 to 9.
In order to guess the correct numbers you need to type four numbers in special field. The computer fixed how many correct numbers you have guessed.
Continue to enter different combinations until you guess valid set of numbers.
Four game modes:
Single - just try to guess number without time and tries limits.
One chance - you have 8 combinations and you have just one chance to guess the number.
Speed mode - try to guess number in 60, 150 or 300 seconds.
Multiplayer mode - play with other gamers.