What are the most useful tips for finding hidden recipes for vehicles in Little Alchemy 2?

In Little Alchemy 2, finding hidden recipes for vehicles can be both challenging and rewarding. Vehicles are often created by combining elements that represent movement, machinery, or transportation. Here are some useful tips and specific steps to help you discover hidden vehicle recipes:

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1. Start with Basic Vehicle Components
Many vehicles are built from combinations of motion, machinery, and materials. Begin by experimenting with these foundational elements:
- Motion + Metal: This often leads to basic vehicles like a car or bicycle.
- Wheel + Metal: A common combination for vehicles like a cart or car.
- Wheel + Wood: Can create simpler vehicles like a wagon or cart.

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2. Combine Vehicles with Other Elements
Once you have a basic vehicle, try combining it with other elements to create more advanced or specialized vehicles:
- Car + Air: Creates an airplane.
- Car + Water: Creates a boat or submarine.
- Boat + Air: Creates a seaplane.
- Bicycle + Air: Creates a hang glider or paraglider.

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3. Experiment with Movement and Energy
Vehicles often require some form of energy or movement to function. Try combining vehicles with energy-related elements:
- Car + Electricity: Creates an electric car.
- Boat + Steam: Creates a steamboat.
- Airplane + Rocket: Creates a spaceship.

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4. Think Outside the Box
Some vehicle recipes are less obvious and require creative thinking. For example:
- Human + Bicycle: Creates a cyclist (not a vehicle, but related).
- Horse + Cart: Creates a horse-drawn carriage.
- Metal + Bird: Creates an airplane (since birds inspire flight).

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5. Use Hints Strategically
If you're stuck, use the in-game hint system to reveal possible combinations. Hints can guide you toward hidden recipes without giving away the exact steps.

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6. Explore Related Categories
Vehicles often overlap with other categories like machines, tools, or transportation. Experiment with combinations from these areas to uncover hidden vehicle recipes.

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7. Common Vehicle Recipes
Here are some specific combinations to help you get started:
- Car: Metal + Wheel or Motion + Metal.
- Bicycle: Wheel + Wheel or Wheel + Human.
- Airplane: Bird + Metal or Car + Air.
- Boat: Water + Wood or Water + Metal.
- Spaceship: Airplane + Rocket or Rocket + Metal.

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8. Keep a Record
Track your experiments in a notebook or digital document. This helps you avoid repeating combinations and keeps you organized as you work toward discovering hidden recipes.

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By following these tips and experimenting with logical combinations, you'll uncover hidden vehicle recipes in Little Alchemy 2 more efficiently. Happy crafting!