Memorise a few glowing balls, then follow them with your eyes alone while they mix with identical ones. When everything stops, pick out the ones you were given. Each level adds another ball and more speed.
Not memory — holding several things at once
Memorising does not help here. The starting positions scatter immediately, and the balls keep changing direction off the walls and each other. What you need is the ability to hold several objects at the same time, the task cognitive science calls multiple object tracking. Most people hit a wall at three or four. Checking the balls one at a time collapses as soon as the level rises — you lose one while your eyes are on another.
| Level 14+ | Eagle eye — holding six at high speed |
|---|---|
| 11–13 | Top tier |
| 8–10 | Tracks well |
| 6–7 | Above average |
| 3–5 | Average — a limit of three or four is normal |
How to play
- Press START. Balls are scattered and some of them pulse gold — you get 1.7 seconds to note which.
- The glow goes out, every ball turns the same grey, and they start moving. Follow them.
- When they stop, tap only the balls that were gold. The count is shown at the bottom.
- Get them all and you move up a level. Miss any and the correct ones are revealed in gold while you lose a heart.
- Three hearts gone and you reach the result screen. Your score is the last level you cleared.
What changes as you climb
You start tracking 2 balls and gain one every two levels, up to six. The total number of balls grows with it (twice the tracked count plus two), so there is more to lose them in. Speed rises every level, and the mixing phase stretches from 3.2 to 7.5 seconds. Past six balls only speed and duration increase, so the high levels become a test of sustained concentration.
Tips
- Do not chase one ball at a time. Keep your gaze central and watch the shape the gold balls make. Three of them are a triangle, four a quadrilateral, deforming as it drifts — this goes much further than chasing.
- Check the ones near a wall first. A bounce is a moment where the position is certain, which makes re-acquiring easy.
- Overlaps are the trap. It is easy to swap two balls as they pass through each other, so remember the direction each was heading just before.
Scoring and the leaderboard
Your score is the last level cleared, higher is better. A miss never lowers the level — it only costs a heart — so clearing level 7 and then missing three times ends at 7. Level 1 and up can be posted, one row per signed-in account. Ball size and speed are set inside a square stage that scales with the screen, so a phone and a desktop are exactly as hard.
Frequently asked questions
Can I just screenshot the screen?
No. The balls move after the glow fades, so a shot of the starting positions tells you nothing about where they end up. Recording and scrubbing back would work, but the picking window closes while you do it.
Why do the balls collide?
If they passed through each other they would clump and drift as one blob, turning tracking into luck. Bouncing keeps every run different. Collisions do not change the speed — each ball is renormalised to the level speed.
How many is normal?
Research usually puts the limit around four. Stalling at level 6–7 (four balls) is typical; holding five or six reliably is genuinely good.
Related tests
- Dynamic Vision Test — reading things in motion
- Sequence Memory Test — remembering what stands still
- Schulte Table — training a wide gaze
- N-back Test — holding several things in working memory