This Zillions game is designed for human playing against human.

Click the main board anywhere to let the system create a random setup of red, blue and green 'crystal seeds'.
Choose a colour which determines which of the seedlings you want to 'grow' by clicking the small coloured tile at the right border repeatedly (or accept the default colour). This colour can be changed for each new crystal.

You have to build structures ('crystals') which are 4-fold symmetric, i.e., they are mirrored along the horizontal, vertical and the diagonals.
Click the board to select which position should be the centre of your crystal.
The position (or 4 positions) of the centre must cover a tile of the selected colour.
From now on, click positions adjacent to the excisting crystal.
The system will automatically fill in all additional tiles to keep the crystal symmetrical.
All positions covered must be either empty or of the chosen colour!
If you place a tile in such a position that the symmetrically added tiles cannot be fitted you lose.

A finished crystal must cover exactly 4 positions of the chosen colour.
You will see up to 4 counters appear next to the colour button.
Once you have covered 4 coloured squares, you can hit the 'Crystal Finished' button.
The grown crystal will then change colour and the area of all the crystals you have created will be calculated.

If a player sees no chance to grow a new crystal, he must pass by clicking the PLAYER button before starting a new crystal.
If both players have hit the PLAYER button, the system will declare a win based on the scoring.

Fixed setups: Click the MENU ('M') button to see a list of 50 challenges with fixed setups.
In challenges numbered 41 to 50 you may vary the selected crystal colour during the game.

Variants: there are 4 randomized setups with different amounts and colours of tiles dropped.
There is also a variant where you can create your own setup. Click the board first.

PLAYER 2 IS ALLOWED TO AMEND THE RANDOM SETUP: In random setups with only 60 pieces dropped the first player can be heavily advantaged by the random setup, which could give him an easy win. That is why there is the following additional rule which balances the game somewhat:
After the random setup Player 2 is allowed to add up to 20 seeds on the board (using CTRL+C, CTRL+V and mouseclick) before Player 1 starts his first crystal. Setups with 120 pieces dropped are more balanced and strongly recommended by the author.

Please note that there are several alternative piece sets available.

 
'Crystal For Two' is a modified version of the two-player game 'Crystal' mentioned in the 'Encyclopedia of Games' by Barb Whiter.

More freeware and real puzzles and games at my homepage: karl.kiwi.gen.nz.