Connect the circles in order as quickly as you can. Tests executive function and cognitive flexibility.
Easy
8 nodes -- Numbers only (1-2-3...)
Medium
12 nodes -- Numbers only (1-2-3...)
Hard
16 nodes -- Alternating numbers and letters (1-A-2-B...)
Scientific Background
Based on: Trail Making Test (TMT-A and TMT-B) (Reitan & undefined, 1958)