Which artifact is considered the most powerful and potentially world-changing

Okay, this is one of the "ultimate debates" among Doraemon fans. If I had to choose just one, my answer would be: The What-If Phone Booth (Moshimo Box).

Let me explain in detail why, and also discuss some other strong contenders.

The Champion: The What-If Phone Booth (Moshimo Box)

You might think the Time Machine or the Anywhere Door are more powerful, but the true strength of the What-If Phone Booth lies in the fact that it doesn't change a single event or location; it alters the fundamental operating rules of the entire world.

How does it work?

Simply put, you step into the phone booth, pick up the receiver, state your "What if..." scenario – for example, "What if this world had no exams?" – and then hang up. When you step out, the entire world has truly become a parallel universe without exams.

Why is it the most likely to overturn the world?

1. Reshapes Reality, Doesn't Just Alter History The Time Machine travels along a single timeline, modifying "events." The What-If Phone Booth directly creates a brand new parallel universe, modifying the "laws." These are fundamentally different.

   • Example: Nobita didn't want money, so he wished "What if the world didn't use money?" The result was the entire world entering a barter era, with the monetary system vanishing completely. This change is foundational; any government, bank, or economic system becomes meaningless in its face.

2. Limitless Possibilities Its power has almost no boundaries. You can wish for anything:

   • Social Structure: "What if everyone in the world was equal, with no social classes?"
   • Physical Laws: "What if humans could fly like birds?"
   • Cultural Concepts: "What if lies didn't exist?"
   • Ethics/Morality: "What if doing bad things resulted in immediate punishment?"

   Any single wish is enough to instantly collapse and restructure the existing civilization. It's not technological innovation; it's a tool of "creation" level power.

3. The Only "Side Effect" – Memory Retention The most terrifying aspect is that usually only the wisher (like Nobita) retains memories of the original world. They find themselves in a world both familiar and alien, while everyone else accepts the new reality as normal. This sense of isolation and cognitive dissonance is itself a massive psychological shock.

Summary: The What-If Phone Booth is the ultimate "disruptive technology" because it acts directly on the world's "source code." Most other gadgets play within the existing rules; this one changes the rules themselves.

Strong Contenders

Of course, besides the What-If Phone Booth, several other gadgets also have world-overturning potential.

Runner-Up: The Time Machine (Time Machine)

This is the most familiar gadget. Its disruptive power lies in absolute control over information and causality.

• Changing the Past: The most direct use. Going back to buy a winning lottery ticket is child's play. The truly terrifying aspect is altering key historical events, like preventing a war or assassinating a historical figure. Even a small change can drastically alter the future through the "butterfly effect."
• Monopolizing the Future: Whoever controls the Time Machine controls all future information – stock market trends, technological breakthroughs, natural disasters. This renders all competition, prediction, and planning meaningless.
• Why it's slightly inferior?: The Time Machine still operates by "modifying" events within a predetermined chain of cause and effect, carrying extremely high risks (like the "grandfather paradox" potentially erasing the user). Its power is immense but requires precise operation, like a scalpel. The What-If Phone Booth, in contrast, is like replacing the entire operating table and patient – simpler, cruder, but more thorough.

Honorable Mentions: Gadgets that Instantly Alter Social Structures

These gadgets, while not reshaping fundamental laws like the top two, are powerful enough to instantly paralyze or restructure modern society.

• Anywhere Door (Dokodemo Doa)

  • Disrupts: Transportation, logistics, real estate, geopolitics
  • Impact: With it, commute time and logistics costs drop to zero. Property values in city centers would plummet, as living in the Sahara Desert becomes equivalent to living downtown. The concept of "borders" blurs, and physical defenses become useless. Globalization would be redefined.

• Copier Liquid (Baibain)

  • Disrupts: Economics, resource allocation
  • Impact: Doubles any object every 5 minutes. Theoretically, it can create infinite matter. Whether it's food, water, or gold, scarcity problems vanish with a single drop. This would directly destroy the entire modern economic system built on "scarcity." Of course, mishandling it could lead to a universe-level disaster, as seen in the chestnut buns episode.

• Dictator Switch (Dokusai Switch)

  • Disrupts: Politics, sociology, ethics
  • Impact: This is one of the most chilling gadgets. Press the button, say the name of someone you want gone, and that person is completely erased from existence, with no one but you remembering they ever existed. It's the ultimate power tool, enabling the user to become a true "dictator" by effortlessly eliminating dissenters. Its disruptive power lies in granting absolute control over life, death, and existence itself – the epitome of dystopia.

Final Conclusion

In summary:

• The What-If Phone Booth is a disruptor at the law/fundamental rule level, capable of rewriting how the world operates.
• The Time Machine is a disruptor at the causality/information level, capable of manipulating history and the flow of information.
• The Anywhere Door and Copier Liquid are disruptors at the social structure level, capable of destroying existing economic and geographic frameworks.

But when it comes to the most powerful, most world-overturning gadget, it has to be the What-If Phone Booth. It doesn't just give you a powerful buff within the game; it lets you tweak the game's code itself. That kind of power is the most fundamental and thorough form of disruption.