Look closely at the coin rings—they may appear slightly differently than the final release.

Sources:

Nintendo distributed this build on Dev flash carts (DS-1 or DS-2 boards) to about 50 kiosks on the E3 floor. After the show, most were wiped or destroyed. One was not.

If you are a retro game historian or a curious fan, here is the recommended workflow to experience the without risk to your computer or your conscience.