The game Pusher has a 9x9 grid that has Gem dispensers on all 4 sides. You simply move the pieces so that 3 or more line up horizontally and they dissapear. Nice variation on the falling block games.
THere is a 12 level Demo (11MB) you might like to try.
Nice addictive little game...
"And regrettably your planet is one of those scheduled for demolition"