What is this game about?

Filler is a simple and addictive game for 1 or 2 players. The screen 
is filled with small colored hexagons. The objective is to accumulate 
as many hexagons as possible. By changing the color of your hexagons 
you acquire all neighboring hexagons of the color you chose. The 
player to collect 689 hexagons wins. 

The play field consists of small colored six corner cells. Players 
start playing from different starting points. At the beginning of the 
game players own one or more cells of the same color. The colored 
cells have different colored neighbor cells. Players can change the 
colors of the cells they own by clicking on color buttons situated 
under the playing field. Colored buttons have numbers and you can 
choose colors by pressing the number keys on your keyboard (note: you 
can't choose your opponent's colors). When you change a cell's color, 
you acquire those cells of the same color belonging to your neighbor. 
By doing this you obtain more and more cells. The objective of the 
game is to occupy as many cells as possible. When you own more then 
688 cells you win the game.