Fermigo: Thinking Games

Eristo Apps

About this game

Fermigo is a playful thinking app for curious kids.
Designed for short, meaningful screen-time sessions, Fermigo helps children practice logic, problem-solving, observation, estimation, pattern recognition, and flexible thinking through fun mini-games.
Inside Fermigo, kids can explore a growing collection of thinking games:
Brain Teasers
Riddles and word-based challenges that encourage kids to slow down, read carefully, and think before answering.
Guesstimations
Fermi-style estimation problems where there is no perfect answer, only smart reasoning. Kids learn to make assumptions, compare possibilities, and explain their thinking.
Ferdoku
A playful picture-based sudoku game with Fermi the raccoon, designed to support logic, attention, and pattern recognition.
Optical Oh!
Kid-friendly optical illusions that invite children to observe, question what they see, and discover how perception can trick the brain.
Pattern Quest
Visual pattern challenges that help kids notice relationships, sequences, and hidden rules.
Fermigo is built around the idea that screen time can be short, playful, and purposeful. Instead of endless scrolling, children get quick thinking challenges designed to spark curiosity and create small moments of learning.
After a play session, Fermigo can also encourage offline challenges that bring thinking into real life — estimating, observing, asking questions, and exploring the world around them.
Why parents love Fermigo:
• Short and focused play sessions
• No social feed
• No direct messaging between users
• No user-generated public content
• No pressure-based gameplay
• Positive feedback and child-friendly explanations
• Thinking games designed for curious young minds
Fermigo is made for children who like puzzles, riddles, smart questions, visual challenges, and playful problem-solving.

What’s new

Bug fixes and app improvements.