Two pictures sit side by side. Most icons match. A few have been changed. Children circle every difference.
Easy changes three icons on a small grid. Hard changes six icons on a busier 4×4 scene.
Find 3 differences — easy.
Circle 3 differences on the picture on the right.
A visual-discrimination generator: it places a unique icon in every cell, clones the scene, then replaces exactly the number of cells the difficulty asks for. The answer key is the list of changed cells — generated, not authored.
Skills practiced
Print tip: Icons print as solid shapes. The two scenes stay on one A4 page — Hard is the busiest; check print preview for younger children.