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Synapse Sprint

Number Span — step 21

Target6 digits or more
LevelBackwards · Hard
Run codeDC2B-59B5

Open. Reach the target to open step 22.

Setting up the lane…

What this step asks

Type back a number of 6 digits backwards, last digit first on the Backwards · Hard level. The first number has 5 digits and every correct answer adds one, so 2 correct answers take you there. You have 14 rounds and 3 lives.

The numbers behind the target

  • Each digit is on show for 520 ms with 160 ms before the next, so a 6-digit number takes about 4.1 s to appear.
  • No digit repeats back to back and there are no runs like 4-5-6.
  • Rounds to spare for slips: 12 of 14.

Before you start

First steps are about finding the rhythm of the game. Run it once just to watch, then run it to clear it.

The run code fixes the tasks, so every retry is the same course. What you learned on the last attempt still applies.