Spot the prime numbers and tap them before time runs out — a simple but surprisingly deep speed math game.
HOW TO PLAY
Bubbles float across the screen showing numbers. Tap only the primes! You have 30 seconds — how many can
you get right? Tapping a composite number counts as a miss, so think fast.
FEATURES
· Global Leaderboard — Submit your score and compete with players worldwide
· 4 Difficulty Levels — EASY / NORMAL / HARD, plus a secret LEGEND mode to unlock
· Digit Customization — Choose 1 to 5 digits. Bigger numbers = harder = higher points
· Combo System — Chain correct taps to multiply your score
· Training Mode — Practice without a timer and sharpen your prime sense
· Dark / Light Theme — Easy on the eyes, day or night
· Japanese / English supported
WHO IS IT FOR?
Anyone who loves math or numbers
People looking for a quick mental workout
Players who want to compete on leaderboards
Anyone who wants to train focus and reaction speed
A prime number is any integer greater than 1 that can only be divided by 1 and itself (2, 3, 5, 7, 11,13…).
They seem familiar — until the numbers get big. That's the challenge.
Watch a short video ad to enjoy 1 hour of ad-free play.
So, what's your score?
Ratings & Reviews
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Daily play just got better — use your gear freely!
◆ Way more items
• Daily login now grants every item type, and the longer your streak the more you get each day (up to 7 of each)
• Bigger rewards from daily missions, challenges, and ads
◆ Daily refill & item conversion
• Equipped items top up automatically every day
• Convert spare items 1:1, or craft an Ultimate from 10 of them
◆ New: Ultimate slot (a once-per-game special)
• 30-Second mode — Prime Rush: the whole board instantly turns into 2s!
• Prime Musou — Prime Rampage: wipe the screen + unlimited barrier for 8s
◆ Musou risk items retuned
• Surge & Overdrive drop their score multiplier and instead crank enemy spawn rate and speed — high-risk items where volume and skill earn the points
Plus minor tweaks and bug fixes.
Version 2.2.0
The developer, Hiroki Sekimoto, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
Identifiers
Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Identifiers
Usage Data
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
Hiroki Sekimoto
Size
53 MB
Category
Casual
Compatibility
Requires iOS 17.0 or later.
iPhone Requires iOS 17.0 or later.
Mac Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
