Sudoku PuzzlePrize is a free-to-play classic Sudoku puzzle app for Android users. What makes this app unique is that by completing puzzles, you get a chance to win Amazon.com Gift Cards* in a sweepstake. The gift code appears on your screen immediately if you win, allowing you to copy and use it right away.

Sudoku is a puzzle game where the numbers 1 to 9 are placed in 9x9 squares separated by 3x3 blocks. The objective is to fill every row, column, and 3x3 block with the numbers 1 to 9 without repeating them. Playing the game is easy, just enter one of the numbers 1-9 in the empty squares. However, the same number cannot be placed twice in a row, column, or block of 3×3 squares surrounded by bold lines.

The app is free and requires no registration. You can solve Sudoku puzzles and draw lots to win Amazon.com Gift Cards* on the spot.