iHit&Blow app for iPhone and iPad

What is Hit & Blow:
It is a game which you infer the selected-digit of a number from the number of "Hit" and "Blow."

Rules:
- Each digit is a different number
- The answer may begin from "0"
- If you cant guess the correct number
before 20 turns, the game will be over
- If you cant guess the correct number
before 5 minutes, the game will be over

Terms:
- Hit : correct in both number and place
- Blow: correct in number but wrong place

Features:
- You can choose 3~6-digit
- For each digit, top 10 ranking recorded
- Scores = turn × time (less score gets highter rank)

Example:
Answer 1234 Entered 2135 → 1 Hit 2 Blow

Dont think too hard ^_^