It's a bit of a mystery why SEGA didn't just go the extra mile and include the original game in here too. Sure, it looks dreadful by today's standards, with its triangle head zombies and all, but that doesn't make it any less fun. In fact, it's probably gotten even better with age, like fine wine injected into cheese.
But even so, this is a very worthy purchase. It's only twenty bucks more than Billy the Wizard. You can even turn the on-screen cursors off (and fully calibrate the Wii remote from the pause menu) for that authentic arcade experience! Have some music from Daytona USA playing in the background and it'll feel like you're really there.