Zero 21

Zero 21 is a smart card puzzle game that tests your math and logic. Stay between 0 and 21 to win. Easy to learn, deeply strategic, and perfect for all ages!

Challenge your mind to the ultimate in arithmetic

Simple but challenging gameplay

Zero 21 offers a straightforward gameplay: keep your total score between 0 and 21. It sounds easy, but when the cards have positive and negative values and unexpected changes from special cards appearing, maintaining a "safe" state is a real challenge.

• You will start with an initial score.
• A series of cards with + or - values will appear on the table.
• Each turn, you choose a card to apply its value to the current total score.
• If the total score exceeds 21 or falls below 0, you immediately lose.

Special types of cards appeal

One point that makes Zero 21 different and attractive is the special cards, which not only change the score but can also completely change the situation of the game:

• MIN (Set = 1): Set the total score to 1 - extremely useful when the score is too high.
• MAX (Set = 20): Increase the total score to 20 immediately.
• MID (Set = 10): Balance the score.
• X2 or /2: Double or halve the total score - extremely risky but beneficial.
• CLEAR: Remove some cards from the sequence.

In addition, the game also has a Hold Slot, where you can store a card for later use. Using this function at the right time can help you "escape death" in difficult situations.

An effective brain training game

This is not only an entertaining game, it is also a great tool to practice logical thinking, calculation reflexes and planning skills. Players must:

Read the sequence of cards in advance to predict the next steps.

Weigh the risks of using or keeping a card.

Evaluate the current situation to choose how to use a special card at the right time.

Zero 21 is suitable for both students, students, and office workers - those who want to have fun and practice thinking in their free time.

Next game: Super Mario Uno