Guide
How to find the numbers faster
Look at the centre, not along the rows.
Fix your eyes on the centre cell and let side vision catch the numbers. Running your eyes along each row is the slow way.
Don't say the numbers to yourself
Reading every number in your head slows you down. Look for the shape of the next number instead.
Lost your place? Keep going
Don't go back to the start of the row. Look for the next number from where you are, the clock keeps running anyway.
Grow step by step
When 5 × 5 gets steady under the goal, move on: thirty numbers, the two-colour Gorbov table, then the shuffle.