Medusa
Not unlocked yetComplete image 15 on the Mythology book.
St. George and the Dragon
Not unlocked yetComplete image 16 on the Mythology book.
Poseidon
Not unlocked yetComplete image 17 on the Mythology book.
Ra and Thoth
Not unlocked yetComplete image 18 on the Mythology book.
Zeus
Not unlocked yetComplete image 19 on the Mythology book.
Hades and Cerberus
Not unlocked yetComplete image 20 on the Mythology book.
Mythology
Not unlocked yetComplete all images on the Mythology book.
Columns
Not unlocked yetComplete image 1 on the Illusions book.
In or Out
Not unlocked yetComplete image 2 on the Illusions book.
Wavy
Not unlocked yetComplete image 3 on the Illusions book.
Colored Balls
Not unlocked yetComplete image 4 on the Illusions book.
Youth or Age
Not unlocked yetComplete image 5 on the Illusions book.
Parallel Lines
Not unlocked yetComplete image 6 on the Illusions book.
Rubin's Vase
Not unlocked yetComplete image 7 on the Illusions book.
Elephant's Legs
Not unlocked yetComplete image 8 on the Illusions book.
Checker Shadow
Not unlocked yetComplete image 9 on the Illusions book.
Rabbit or Duck
Not unlocked yetComplete image 10 on the Illusions book.
Penrose Triangle
Not unlocked yetComplete image 11 on the Illusions book.
Non-Spiral
Not unlocked yetComplete image 12 on the Illusions book.
Straight Grid
Not unlocked yetComplete image 13 on the Illusions book.
Straight Lines
Not unlocked yetComplete image 14 on the Illusions book.
Impossible Ring
Not unlocked yetComplete image 15 on the Illusions book.
Rotation
Not unlocked yetComplete image 16 on the Illusions book.
Perspective
Not unlocked yetComplete image 17 on the Illusions book.