Game Gear cart works only in other Gears

[Nostalgic]

I recently picked up a Sonic Blast cartridge from a local used video game store. I had the worker there demonstrate that the cartridge works by playing it in a Game Gear at the store.

 

I tried it in my Game Gear at home. I just get a blank screen. I've tried cleaning the cartridge with rubbing alcohol a couple of times with no change.

 

My Game Gear plays the other games that I have with no trouble.

 

So I have a Sonic Blast that plays in Game Gears besides mine and my Game Gear plays other games fine.

 

Is Sonic Blast incompatible with some Game Gears? Do I need to try more cleaning?

 

Does anyone have tips for getting this game to work?

 

Your help is appreciated. Thank you!