Chimp Test
Numbers appear on screen. Take as long as you need, then tap 1 — the rest are covered by white squares straight away. Tap them in order from memory.
Based on the Inoue & Matsuzawa (2007) study at Kyoto University showing young chimpanzees consistently outperform human adults at this working memory task. The average human reaches level 5–6. Chimps regularly reach level 9+.
Example — tiles show their numbers, then go blank
Tap in order: 1 → 2 → 3 → 4 after they're covered