Twin Flakes

Visual detail and memory exercise. Snowflakes flash one at a time around a ring. Most are near-copies; two are identical. Find where the twin flakes appeared.

How it works

Each round shows three to five snowflakes, one at a time, each in a different spot on a ring around the centre. All of them are the same colour. Two are identical; the others each differ from that pair in one feature, such as the shape of the arm tips, the number of side branches, or a hole in the centre. Every change repeats on all six arms.

After the last flake, tap the two spots where the twins appeared. There is no time limit on the answer. When you find the pair twice in a row the flashes get shorter; a miss makes them longer. Over a session this settles on the flash length where you find the pair about seven times in ten, and that is the number shown at the end. Lower is better.

As you level up, the rounds add more flakes, the look-alikes get closer to the twins, and the ring spreads wider so your eyes travel further. Only one of those changes at each level.

Read the in-game instructions before beginning. You can return home between exercises; there is no requirement to finish all five in one visit.

Understanding your result

Flash lengths are timed in whole screen refreshes, so a 60 Hz and a 120 Hz screen give comparable numbers. The spacing on the ring is estimated from the type of device, not measured, so results on a phone and on a desktop monitor are not directly comparable.

This is not a vision test, an eye-movement assessment, or an assessment of driving fitness. Practice effects in a game do not by themselves prove improvement in everyday memory or prevention of cognitive decline. If you are concerned about a change in memory or vision, speak with a qualified health professional.

Cost and saved progress

This exercise is free. It runs in a modern browser, requires JavaScript, and has no sign-up. Your saved game progress remains on this device in this browser. Clearing browser data can remove it.

Choose another memory exercise or learn about limbr.