Trail Making Test
Connect 25 numbered circles in order as fast as possible (Part A), then alternate between numbers and letters — 1→A→2→B… (Part B). A classic test of processing speed and cognitive flexibility.
How to Play 🔗 Trail Making Test
The Trail Making Test is one of the most widely used neuropsychological assessments in the world, originally developed as part of the Army Individual Test Battery in 1944 and now used routinely in clinical settings to screen for cognitive impairment, brain injury, ADHD, and dementia. This version brings both parts of the test into your browser. In Part A, 25 circles numbered 1 to 25 are scattered randomly across the screen. Your job is to click them in ascending numerical order — 1, 2, 3, and so on — as quickly as you can. Part A primarily measures visual scanning, psychomotor speed, and simple sequencing. Part B is significantly harder: the 25 circles contain a mix of numbers (1 to 13) and letters (A to L). You must alternate between them in ascending order — 1, then A, then 2, then B, then 3, then C, and so on. Part B demands cognitive flexibility, because your brain must constantly switch between two mental sets (number sequence and letter sequence) while continuing to search the screen for the next target. In clinical research, the ratio of Part B time to Part A time is used as a measure of pure cognitive flexibility, since it removes the contribution of basic motor and visual scanning speed. Most adults complete Part A in 25 to 40 seconds and Part B in 55 to 90 seconds. Errors are counted but do not stop the test — they add a small time penalty as you correct course. Your best times for both parts are saved locally.
- ✅ 100% free to play
- ✅ No download or installation
- ✅ No account or sign-up needed
- ✅ Mobile and touch friendly
- ✅ Works on all modern browsers