Rainbow Sudoku app for iPhone and iPad

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Overview
Rainbow Sudoku brings a colorful new twist to the popular puzzle game Sudoku. Rather than using traditional numbers to solve the puzzle, use the colors of the rainbow instead! Complete the puzzles in a faster time to get higher scores!

How to Play
The game board is split into nine 3x3 (square) blocks. Colors must be placed in the squares without repeating the same colour in a block. A colour must also not be repeated within the same row or column of the game board. Hints can be used to help you solve the puzzle.

Levels
The game has three different difficulties, easy, medium and hard. Each difficulty has twenty free games avalible. Additional levels for each difficulty can be purchased.

In App Purchases
The game has many purchases avaliable for the user.
1. New Levels - Additional levels may be purchased (for each difficulty) in packs of ten. A pack of ten levels costs just $0.99!
2. Hints - Hints are avaliable to be used each game. A hint randomly enters a correct answer onto the game board, or corrects an incorrect answer on the game board. Players automaticaly receive 1 hint per day. Additional hints are avaliable for purchase. 5 hints are purchased for $0.99
3. Ads - The free version of the game has inbuilt ads. Remove the ads for just $0.99

Scores
Once you complete a level a score in stars is allocated. The star ratings are based on time taken to solve the puzzle. Star ratings for each difficulty are provided below.
Easy - 3 stars = <4 mins, 2 stars = <7 mins, 1 star solved
Medium - 3 stars = <6 mins, 2 stars = <9 mins, 1 star solved
Hard - 3 stars = <8 mins, 2 stars = <11 mins, 1 star solved