Tangram

Tangram gives you seven flat shapes — triangles, a square, a parallelogram — and a silhouette you have to fill completely by rotating and arranging every piece with no gaps or overlaps. The pieces never change between puzzles; what changes is the outline you're matching, and some outlines make it genuinely hard to tell which piece belongs where until you rotate it into place and see how it sits. Difficulty runs from Beginner up through Expert, and the jump between tiers is noticeable rather than cosmetic. There's a long run of levels, so reading a silhouette at a glance becomes a skill you build over time. It suits anyone who likes puzzles that are entirely visual, with no reading or vocabulary involved.