🧩 Level Information

• Level Number: 105
• Problem Statement: Start feeding the fish from the bottommost fish, as feeding a fish twice will be incorrect.
• Difficulty: Normal

🎯 Objective

Feed all the fish in the correct order (from the bottommost to the top) to avoid feeding any fish twice.

📝 Solution Steps

1. Ensure that there are multiple vertically aligned fish on the screen along with fish feed (fish food or a feed bag).
2. Note the instruction, "feeding a fish twice will be incorrect" and understand that you must not feed the same fish twice.
3. Drag the feed to the fish at the very bottom and release your finger to let the fish eat.
4. Next, drag the feed to the second-bottommost fish and feed it.
5. In the same manner, continue feeding the third-from-bottom fish, and then the fourth-from-bottom fish, and so on, always moving to the "next fish above."
6. Ensure that you do not pass the feed to a fish that has already been fed by always proceeding from bottom to top.
7. If every fish has been fed once, the stage will be cleared.

💡 Hints

• Feeding a fish again that has already been fed will result in failure. Think about the order that prevents you from feeding the same fish twice.
• The feed must be given from top to bottom or from bottom to top. Which direction is safer?
• The correct answer is to feed the fish in order from the bottommost to the top. Proceeding from bottom to top ensures that no fish gets fed twice.

🧠 Analysis & Points

The key to this stage is the "order" puzzle. Since feeding the same fish twice results in failure, you need to carefully plan the route for passing the feed. If you start feeding from the top fish in order, while feeding the bottom fish, the feed will pass again in front of the fish that has already been fed from above, resulting in being treated as having fed the same fish twice. Hence, it is crucial to limit the route for passing the feed in one direction without passing twice. The simplest and surest method is to feed the fish from "bottom to top," as this order prevents the need to pass through the bottom again later, completely preventing the situation where the feed reaches the same fish twice. Logically, this puzzle involves understanding the structure where revisits occur when passing consecutively from top to bottom and constructing an order that avoids re-visits.

🔍 Common Mistakes

• Feeding the topmost fish first, and then passing in front of the top fish again when feeding the bottom fish.
• Starting to feed from a middle fish randomly, resulting in some fish being fed twice.
• Attempting to feed by tapping and not recognizing the need for drag operation.
• Forgetting the position of the fish that was already fed and passing the feed again in front of the same fish.

🎉 Advice After Clearing

This stage teaches the concept that proceeding from the bottom ensures you don't pass through the same place twice. Remember that solving the order can significantly simplify the problem.

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