What are the most challenging hidden game mechanics in Little Alchemy 2?

In Little Alchemy 2, some of the most challenging hidden game mechanics involve discovering rare or non-intuitive combinations that aren't immediately obvious. These often require creative thinking and experimentation. Below are some tips and steps to uncover these hidden mechanics and elements:

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1. Understanding Hidden Elements
- Some elements are not directly visible in the game's interface until you discover them. These include:
- Philosophy: Created by combining Human and Idea.
- Unicorn: Created by combining Horse and Rainbow.
- Time: Created by combining Clock and Sand or Glass and Sand.
- These elements often serve as building blocks for other rare combinations.

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2. Experimenting with Abstract Concepts
- Some of the most challenging combinations involve abstract or conceptual elements. For example:
- Life: Combine Energy and Swamp.
- Human: Combine Life and Clay.
- Idea: Combine Light Bulb and Human.
- These combinations require thinking beyond physical objects and considering how concepts interact.

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3. Using Time-Based Elements
- Elements like Time and Clock are often used in advanced combinations. For example:
- Tree: Combine Time and Plant.
- Corpse: Combine Time and Human.
- These combinations simulate the passage of time, which is a unique mechanic in the game.

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4. Exploring Mythical and Fantasy Elements
- Some of the rarest elements are mythical or fantasy-based. For example:
- Dragon: Combine Lizard and Fire.
- Phoenix: Combine Fire and Bird.
- Rainbow: Combine Rain and Sun or Water and Light.
- These combinations often require combining natural elements with imaginative twists.

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5. Leveraging Multi-Step Combinations
- Some elements require multiple steps to create. For example:
- Computer: Combine Electricity and Tool.
- Tool: Combine Human and Metal.
- Electricity: Combine Metal and Energy.
- Breaking down complex elements into smaller steps can make them easier to discover.

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6. Using the "Hint" System Wisely
- If you're stuck, the game's hint system can guide you toward undiscovered combinations. However, hints are limited, so use them strategically for the most challenging elements.

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7. Experimenting with Unlikely Combinations
- Some combinations defy logic or require out-of-the-box thinking. For example:
- Brick: Combine Mud and Fire.
- Glass: Combine Sand and Fire.
- Lava: Combine Earth and Fire.
- Don't be afraid to try unusual pairings, as they often lead to surprising results.

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8. Unlocking Hidden Categories
- Some elements belong to hidden categories, such as Myths and Monsters or Space. These categories are unlocked by discovering specific elements, like Unicorn or Galaxy.
- Focus on exploring these categories to uncover rare and unique combinations.

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9. Using the "Cheats" Feature Sparingly
- If you're truly stuck, the game's "Cheats" feature can reveal combinations. However, relying on it too much can reduce the satisfaction of discovery.

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By following these tips and experimenting with creative combinations, you can uncover the most challenging hidden mechanics and elements in Little Alchemy 2. Patience and persistence are key!