Two player reactor - 2 player game

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v2.3
Added new game mode: Country flags

v2.2
Fixed bug with result in player vs player mode not showing up.
Small changed in appearance.

v2.0
Online challenge mode. Play against players all over the world.

v1.4
2 new game modes added:
* two images of each color
* sudoku

v1.3
2 new game modes added:
* all numbers are prime
* blue circle moves faster then red circle

v1.2
2 new game modes added:
* at least one color appears only once
* all images part of one bigger image