An odd-one-out game that runs on thinking, not eyesight. Four pictures appear: three belong to one category and one slipped in from somewhere else — apple, banana, orange, car. Your child taps the one that doesn't belong, and the game says out loud what category the other three were. Trains sorting and reasoning; the categories get closer together as your child improves.
Four pictures show up: three from one category, one from another. Your child taps the one that doesn't belong, and the game names the category of the other three out loud. A wrong answer blinks the right one before the next question. Early levels keep the categories far apart (fruit versus a car); later ones move them close enough to need real thought (land animals versus sea animals, fruit versus vegetables).
Categorization and abstract reasoning — your child has to work out what rule these three share, then check which item breaks it. That is the root of logical thinking.
Tips for parents
After the answer, ask "so what category IS the odd one?" Letting your child name their own category takes them further than simply getting it right.
That one is about differences in the picture — off colour, wrong size — pure eyesight. This one differs by kind, so it takes knowledge and reasoning.
Yes. Children can sort long before they can name the group (they know a dog and a cat go together before they know the word "animal"). The spoken answer teaches the category name at exactly the right moment.
The difficulty follows your child. Two right in a row moves the categories closer; one wrong makes it easier straight away. If it feels too hard, take a break — a new round starts back at level 1.