Move the balls to match the goal in as few moves as you can. 7 levels of 5 puzzles: 3, then 4, then 5 pegs.
Make your board (left) match the goal (right)
About 15 minutes. Not medical advice. Stop if you feel dizzy, nauseous or strained.
Coloured balls sit on pegs of different heights. Tap a peg to lift its top ball, then tap the peg to put it on (or use keys 1–5). Match the goal picture on the right in as few moves as you can. 7 levels of 5 puzzles: level 1 uses 3 pegs, level 2 moves from 3 to 4 pegs, levels 3–4 use 4 pegs and levels 5–7 use 5 pegs with up to 13 balls. Each puzzle allows the best number of moves + 3, and has a time limit: 2 minutes in levels 1–3, 2.5 minutes in levels 4–5 and 3 minutes in levels 6–7. Going over the moves or the time restarts the level. Finishing a level unlocks it on the start screen.
This is a planning puzzle in the style of the Tower of London, a task used in research on planning and problem solving. A quick measure of how you did on this test today, on this device. Practice makes you better at the test itself; it is not a medical or IQ test.
Not medical advice. Stop if you feel dizzy, nauseous or strained.
Mental maths: + −, ×, ÷ and order of operations. 50 BODMAS / PEMDAS questions from basic to hard.
All 195 flags: name the continent, the country and an official language, level by level. Plus a 100-question quiz from a bank of 1,000+ (5 lives) and an A–Z flag explorer.
