Hexagon Invader

Hexagon Invader is a simple tap-tap game
for everyone and good for keeping
capability in rapid-reaction.

- Four game difficulties for any kind of players
- Support color mode(GREEN/YELLOW/RED/WHITE)
and gray mode (colors marked as '2', '1', 'o', WHITE)

Initial map has 61 hexagons, one is
GREEN(or marked '2'), others are
WHITE (no mark). Player only need to tap on
those GREEN(2)/YELLOW(1)/RED(o) hexagons.

While playing the game, the color of hexagons
will keep changing randomly as time goes by.
Player must be very concentrated and tap quickly
to win the game.

The rules:
1. Tap on GREEN, the hexagon changed to YELLOW.
2. Tap on YELLOW, the hexagon changed to RED,
meanwhile the neighbors(WHITE) of the YELLOW
changed to GREEN simultaneously.

*This is the only way to change WHITE to GREEN.*

The GREEN/YELLOW/RED hexagon will change back to
WHITE/GREEN/YELLOW automatically and randomly.

3. Four difficulties:
easy: game time is 90 seconds, one hexagon changed back per second
medium: game time is 180 seconds, two hexagons changed back per second
hard: game time is 270 seconds, three hexagons changed back per second
impossible: game time is 360 seconds, four hexagons changed back per second

3. The goal of game is to tap on all hexagons
to change all of them to RED
before run out of game time.

4. Player lose the game when:
4.1 Run out of game time.
or
4.2 All hexagons have been changed back to WHITE.

That's all. Let's tap-tap. :-)