Transform Digits

⚙️ Settings

Lv 1
Streak 0
Max 0

Read the transformation rule, then tap READY.
Apply the rule to each digit mentally.
Enter the transformed digits in order.

Transformation Rule

Level 1 · Full

Rule hint always visible during input

Rule A

EVEN +1 | ODD -1
4 7 2 → 5 6 3
2.5

Memorize & transform...

✏️ Enter transformed digits in order

EVEN+1 / ODD−1
🎉 Correct!

Rule: EVEN+1 / ODD−1

Shown:

Answer:

Yours:

Streak: 0 | Level: 1

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How to Play

1
A transformation rule is shown with an example. Read it, then tap READY.
2
A sequence of digits appears. Apply the rule to each digit in your head.
3
Enter the transformed digits in their original order.
4
At higher difficulties the rule hint fades or disappears — keep it in mind!
Example
EVEN+1 / ODD−1
4 7 2 → 5 6 3

4 (even) +1 = 5  ·  7 (odd) −1 = 6  ·  2 (even) +1 = 3

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