Chocolate Sweeper

How difficult can it be? Richard Kaye proved that Minesweeper(MS) is NP-complete[1,2]. That means MS can be a very difficult problem even for computers to solve.

We made up such MS into a "perfect" puzzle game. I use "perfect" to mean that no guesses are required to solve puzzles, or even more strictly, no guesses are allowed. Only the squares (means "chocolate cubes" in this game) that are certainly safe can be uncovered (eaten).

This game has two play modes, Game and Puzzle. Puzzle mode has 250 challenging puzzles. In Game mode, you can play random puzzles like standard MS, but they are guess-free. You will never get tired of playing!

Once you play this game, you will realize that MS was such a difficult, but very fun puzzle game.

Some other puzzle games, such as Number Place (aka Sudoku) and Nonogram (aka Picross), are also proven as NP-complete[3,4,5]. Therefore, I can say this game is as much fun as those puzzle games.

Chocolate Sweeper is optimized for mobile screen size and touch interface. This is the best puzzle game you can play on a mobile device!

Please be cautioned that this game is not as sweet as it looks. It is really difficult, and not recommended for those people who just want to play games for relaxation.

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References
[1] Richard Kaye's Minesweeper Pages: http://web.mat.bham.ac.uk/R.W.Kaye/minesw/minesw.htm
[2] R. Kaye. Minesweeper is NP-complete. Mathematical Intelligencer, 22(2):9–15, 2000.
[3] T. Yato. List of NP-Complete Pencil Puzzles: http://www-imai.is.s.u-tokyo.ac.jp/~yato/data2/puzcc.pdf
[4] T. Yato and T. Seta. Complexity and completeness of finding another solution and its application to puzzles. IPSJ SIG Notes 2002-AL-87-2, IPSJ, 2002. http://www-imai.is.s.u-tokyo.ac.jp/~yato/data2/SIGAL87-2.pdf
[5] N. Ueda and T. Nagao. NP-completeness results for NONOGRAM via parsimonious reductions. Technical Report TR96-0008, Department of Computer Science, Tokyo Institute of Technology, 1996.


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