Author: Autumn

Game Introduction:
"Zero21 Solitaire" is a puzzle card game that combines math calculations with Solitaire mechanics. Its core gameplay is very simple: keep the sum of the numbers in your hand between 0 and 21 by constantly clearing cards from the table. Although the rules are simple, later levels heavily test the player's calculation skills and foresight.

I. Game Interface and Basic Rules

Core Rules:

1. Goal: Click on table cards sequentially to clear them all.

2. Restriction: You can only click the top card of each column.

3. Calculation: Clicking a positive number adds to your score; clicking a negative number subtracts from it.

II. Detailed Explanation of Special Function Cards

Beyond number cards, there are several key function cards in the game. They are essential tools for clearing levels, so be sure to understand their uses:

1. MIN Card: Image shows an arrow pointing to the minimum value.

   

2. MAX Card: Image shows an arrow pointing to the maximum value.

   

3. MID Card: Image shows an arrow pointing to the middle value.

   

Card Details:

• MIN (Minimize)

• Effect: Ignores current score and instantly resets it to 1.

• Best Timing: Use when your score is near 20, the screen is full of plus cards, and you cannot continue to add points.

• MAX (Maximize)

• Effect: Ignores current score and instantly resets it to 20.

• Best Timing: Use when your score is near 1, the screen is full of minus cards, and you cannot continue to subtract points.

• MID (Middle Value)

• Effect: Ignores current score and instantly resets it to 10.

• Evaluation: The strongest card in the game! 10 points is in the middle ground, good for both offense and defense. It is a lifesaver at any time.

III. Core Walkthrough Strategies

To go far, mental arithmetic alone is not enough; you need to apply the following strategies:

1. Maintain the "Middle Way" (The 10-Point Rule)

Strategy Analysis:

• The safest points are always 10 or 11.

• At 10 points, even if you encounter a +9, you only reach 19 (safe); if you encounter a -8, you only drop to 2 (safe).

• Avoid Extremes: Unless it is to eat a specific card, do not let your score stay below 3 or above 18 for a long time, as this makes you extremely prone to "sudden death."

2. Use HOLD (Temporary Storage) Wisely

The HOLD zone is usually used to handle two types of cards: fatal cards and strategic cards. Never treat it as a regular warehouse; it is your "sapper" (mine removal engineer).

3. Simple Math Prediction (Next Move)

Before clicking, look one step ahead. Do not just look at the current card; calculate whether you can handle the next card after eating this one.

IV. Summary of Advanced Tips

1. "Balanced Elimination" Method: Don't just stick to one column and eat it all the way down! Try to keep cards in all columns "selectable." If one column is full of plus cards and another is full of minus cards, you need to alternate between them, using plus cards to offset minus cards to maintain a balanced score.

2. Observe Covered Cards: Although you can only click the top card, some covered cards will show their corners. Use this information to decide which column to open first.

3. Function Cards are Safety Latches: Don't eat MIN/MAX cards as soon as you see them. If you can survive without eating them, keep them on the table as a final "lifeline" until absolutely necessary.

One-Sentence Strategy Summary:
Keep 10 in mind, cards in hand; use HOLD when stuck, and advance step by step.

Best of luck challenging higher levels in "Zero21 Solitaire"!

Click to Play: Zero21 Solitaire