Eikoh Seminar x RIDDLER: 'Nazotoki Jito Type Diagnosis 2026 Spring' to be Released April 27
A popular collaboration series between major cram school Eikoh Seminar and riddle creators RIDDLER. This free online diagnosis uses 20 new puzzles to analyze 8 types of 'Jito' (fundamental thinking power).
📋 Article Processing Timeline
- 📰 Published: April 27, 2026 at 23:00
- 🔍 Collected: April 27, 2026 at 14:31
- 🤖 AI Analyzed: April 28, 2026 at 01:11 (10h 39m after Collected)
RIDDLER Inc. (Headquarters: Toshima-ku, Tokyo; CEO: Ryogo Matsumaru), led by puzzle creator Ryogo Matsumaru, has collaborated with the leading cram school 'Eikoh Seminar' (operated by Eikoh Co., Ltd.; Headquarters: Chiyoda-ku, Tokyo; President: Katsuaki Shimoda) to release 'Nazotoki Jito Type Diagnosis 2026 Spring.' This content will be available for free to everyone via smartphone starting Monday, April 27, 2026.
This project is the third installment of the highly successful series that previously saw '#NazotokiJitoTypeDiagnosis' trend on X (formerly Twitter) in Japan, drawing immense response from primary schoolers to adults. Challenges are waiting for you in this long-awaited new edition.
### 20 Original New Riddles, 15-Minute Time Limit
Riddle-solving requires 'inspiration' rather than prior knowledge, making it enjoyable for all ages. Participants will see how many riddles they can solve within the tight 15-minute limit. All problems in this edition are brand-new, created specifically for this project.
### Diagnosis Results for 8 Types
The puzzles are categorized into five areas: Multi-perspective Thinking, Logical Thinking, Trial and Error, Interpretation/Expression, and Creativity. Results determine thinking habits based on accuracy in these categories. A 'Jito Chart' and one of eight types, such as 'Entrepreneur,' 'IT Engineer,' or 'Creator,' will be displayed.
### Free Access via Smartphone or PC
The diagnosis is accessible for free. Note that internet connection fees apply and email registration is required at the entry stage.
### Implementation Overview
- **Release Date:** Monday, April 27, 2026
- **How to Participate:** Enter via the special page on Eikoh Seminar's official website.
- **Cost:** Free
- **Target Audience:** Elementary school students to adults
### About Eikoh Seminar
A major cram school in Japan, primarily in the Tokyo metropolitan area, offering small-group instruction for junior and senior high school entrance exams. They provide strategic face-to-face guidance that leverages each student's strengths.
### About RIDDLER Inc.
Founded in 2019 by Ryogo Matsumaru, a famous puzzle creator active in media. This University of Tokyo-originated group creates puzzle experiences for TV, books, events, and education. In 2023, they opened 'Riddlabo,' a learning studio for elementary students focused on developing essential thinking skills.
This project is the third installment of the highly successful series that previously saw '#NazotokiJitoTypeDiagnosis' trend on X (formerly Twitter) in Japan, drawing immense response from primary schoolers to adults. Challenges are waiting for you in this long-awaited new edition.
### 20 Original New Riddles, 15-Minute Time Limit
Riddle-solving requires 'inspiration' rather than prior knowledge, making it enjoyable for all ages. Participants will see how many riddles they can solve within the tight 15-minute limit. All problems in this edition are brand-new, created specifically for this project.
### Diagnosis Results for 8 Types
The puzzles are categorized into five areas: Multi-perspective Thinking, Logical Thinking, Trial and Error, Interpretation/Expression, and Creativity. Results determine thinking habits based on accuracy in these categories. A 'Jito Chart' and one of eight types, such as 'Entrepreneur,' 'IT Engineer,' or 'Creator,' will be displayed.
### Free Access via Smartphone or PC
The diagnosis is accessible for free. Note that internet connection fees apply and email registration is required at the entry stage.
### Implementation Overview
- **Release Date:** Monday, April 27, 2026
- **How to Participate:** Enter via the special page on Eikoh Seminar's official website.
- **Cost:** Free
- **Target Audience:** Elementary school students to adults
### About Eikoh Seminar
A major cram school in Japan, primarily in the Tokyo metropolitan area, offering small-group instruction for junior and senior high school entrance exams. They provide strategic face-to-face guidance that leverages each student's strengths.
### About RIDDLER Inc.
Founded in 2019 by Ryogo Matsumaru, a famous puzzle creator active in media. This University of Tokyo-originated group creates puzzle experiences for TV, books, events, and education. In 2023, they opened 'Riddlabo,' a learning studio for elementary students focused on developing essential thinking skills.