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Number Span ladder

24 steps, each a fixed run with a target. Clear one to open the next. Targets climb by one digit a step, in order first and then backwards.

Steps 1–4 · In order · Easy 4 digits → 7 digits

Steps 5–8 · In order · Medium 5 digits → 8 digits

Steps 9–12 · In order · Hard 6 digits → 9 digits

Steps 13–16 · Backwards · Easy 4 digits → 7 digits

Steps 17–20 · Backwards · Medium 5 digits → 8 digits

Steps 21–24 · Backwards · Hard 6 digits → 9 digits

Free play: Number Span