Fully Ascending
One step up, every single step.
From the second digit on, each digit is exactly one more than the previous — the whole string climbs in lockstep, like 123, 4567 or 123456. RNGdle requires at least 3 digits.
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Fully ascending numbers are rare because their degrees of freedom collapse completely: once the first digit is chosen, every later digit is nailed down by the "+1" rule, and the first digit itself is capped by length — an L-digit ascending number must start between 1 and (10−L). The entire range holds just 22 of them: seven 3-digit (123 through 789), six 4-digit, five 5-digit and four 6-digit.
Why can't zero lead? "012" written as a number is just 12 — the leading zero evaporates — so the chain must start from 1–9. The theoretically longest ascent is 123456789, but with the range capped at 1,000,000 you can roll at most six digits; a perfect dragon like 1234567 can never appear.
Consecutive digits come with a hidden perk: a step of exactly 1 flips parity every time, so every fully ascending number also hits Alternating Parity for free, and any with 5+ digits is automatically a Straight. 123456 holds four titles at once: Fully Ascending, Ascending Run, Straight and Alternating Parity.