One of you is the architect and sees the picture. The other is the builder and doesn't. The architect describes it in words only — no pointing — and the builder taps the squares. Turning the picture to face the architect helps, but it is an honour system: builders, look away. For a truly hidden picture, print it or show it on the architect's own phone. When you're both happy, compare. Then swap. It works well with a child as architect: grown-ups find out how clear their own instructions are.
The architect's picture · A staircase
A staircase. Row 1: red square, empty, empty, empty, empty. Row 2: red square, red square, empty, empty, empty. Row 3: red square, red square, red square, empty, empty. Row 4: red square, red square, red square, red square, empty. Row 5: red square, red square, red square, red square, red square.
The builder's blocks · tap a square to change it: empty, red square, blue circle, yellow triangle
Ways to play
Easier: the builder may ask yes-or-no questions.
Harder: the architect may only describe rows, never single squares.
Without a screen: draw a 5×5 grid on paper and use coins for blocks.
8 pictures, from easy to tricky. It pairs with RoofPals on Spark & Anvil, where children build to a brief.