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The main objective in GemStrike is to get the required amount of gems in a row. A row in this case can seen as several gems of your own color touching each other. All directions are allowed. Meaning you can achieve a row of the types displayed below:

You can also adjust the following settings:
The size of the playfield: The size can be 16x16 at its largest and 10x10 at its smallest.
The amount of opponents: You can have up to 4 opponents on a single field.
The strength of the opponents: For each opponent you can define how strong they should be.
Finally you can decide who of the players may start.

After you've defined the settings to your satisfaction you can start playing. The player who you selected to start will have to opportunity of putting the first gem on the board.

The player that is the first to get the required row length will become the winner of the game.

Recommended Settings:
Board size: 4 or 5
Number of players: 2 (1 vs 1)
Winning row length: 5
Player 2 difficulty: 3
Starting player: may be both you or the computer

Have fun!

-----------UPDATE--------
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Ok I've fixed the bug where the field becomes unclickable.