/vr/ - Retro Games

A lot of Konami arcade games were significantly harder in the US:

Turtles in Time (more enemy spam, strict invisible timer, fewer powerups, bosses have way more health)
Simpsons (similar to above)
X-Men (removed both mutant power and health pickups entirely, changed how mutant powers work in order to kill the player faster)
Metamorphic Force (removed normal life bar in favor of Gauntlet-style health that ticks down no matter what, tougher enemy configurations, less healing)
Crime Fighters (similar to above)
Mystic Warriors (bosses take way longer to die)
Sunset Riders (removed all extra 1ups, bosses take a million hits to die)

Because they never got to experience playing a beat-em-up at the arcades first.