Written by: Jin Fujisaki / Published: 2026-02-23
For today's elementary school students, learning apps on smartphones and tablets are an everyday part of life. But these versatile devices come with one fatal weakness: there are simply too many distractions. The moment a parent looks away, kids will close the learning app to watch YouTube or start playing a game—and given how children's attention works, that's only natural.
The "Picotore," a digital mental math drill developed by stationery maker Sonic, physically eliminates those temptations. It doesn't connect to Wi-Fi, and it can't play videos. It's a dedicated device that does nothing but let you solve math problems. Yet with its retro-pop design reminiscent of a Game Boy and its satisfying clicky physical buttons, it fully scratches kids' itch to "operate a digital device," making it the perfect safeguard against smartphone dependency before it even starts.
| 15,000 Problems Built In. Auto-Grading and "Retry" Crush Weak Spots
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Just because the functionality is simple doesn't mean the content is thin. The "Picotore Mental Math Drill: Four Arithmetic Operations" packs in over 15,000 math problems (addition, subtraction, multiplication, and division) aligned with the official curriculum guidelines for grades 1 through 4 in elementary school. That's an overwhelming volume equivalent to dozens of paper workbooks.
When a child inputs an answer, the device instantly "auto-grades" it with sound and light. Not only does this free parents from the chore of sitting beside their kids with a red pen marking circles, but the brilliant "Retry function" automatically re-serves only the problems they got wrong. Since kids can immediately redo "exactly where they went wrong," the machine automatically drives the most important cycle in learning: never letting weak spots slip through the cracks.
| Time Attack and Mini-Games Flip the "Motivation Switch"
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The biggest reason paper drills don't last is that kids "drag through them aimlessly with no sense of accomplishment." Picotore comes equipped with a "Time Attack feature" that challenges kids to solve as many problems as possible within a target time. Just adding this gamified element of "time pressure" produces a dramatic shift in a child's focus.
The short, sharp rhythm of "just 5 minutes a day" sharpens concentration to its peak, letting kids experience the thrill of watching their calculation speed climb like an athlete in training. On top of that, three "number-based mini-games" are included as a breather—when they get tired of math drills, they can play a mini-game and then return to the drills. It's a design that naturally instills self-contained motivation management.
| Works on Trains and in Libraries. Thoughtful Details That Reduce Parental Stress
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Its polish as a portable gadget is also high—the body is compact enough to fit snugly in a child's hands. And one feature parents will deeply appreciate is the "Volume ON/OFF" function.
When kids are playing boisterously in the living room, the sound can be on; in quiet places like trains, hospital waiting rooms, or libraries, they can "mute it" and continue studying. When a child gets bored and starts making a fuss while you're out, instead of guiltily handing over your phone to let them watch videos, you can confidently say, "Why don't you do some Picotore?" That kind of peace of mind is an immeasurable benefit.
| Summary: For About 3,800 Yen, You Buy Your Child's Focus and Your Own Peace of Mind
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The price is 3,850 yen including tax. It comes in three colors: White, Mint Blue, and Violet. The series also includes a sister device, the "Picotore English Vocabulary 700," which lets kids learn English words with proper pronunciation.
The "Sonic Picotore" truly takes the best of both worlds—"the convenience of smartphone learning" and "the reliability of paper drills." It's a triple-win learning gadget that boosts your child's math skills game-style while eliminating the burden of grading and worries about smartphone dependency. As a next gift for your child or a celebration for moving up a grade, it's about as practical a pick as you could ever find.
