This Derby Stallion: Thoroughbred Simulation Game sample cartridge, by ASCII, is small and blue.
On the label it’s got a place for the number of the cart. This one shows “1,” but who knows who wrote that in. Like other sample and prototype labels, this one has a white printed label that’s taped onto the cart.
It’s hard to tell from this screenshot whether the game has glitches or the photographer just messed up.
Needless to say, I bet the people who first got to play this horse racing game were ecstatic about it.