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Can I use Planning to place an X if I can't place my number?
The rulebook text covers this directly.
- Welcome to the Moon rulebook · Rulebook · 3 - Write Down a Number (Compulsory)
- TheClerk · Community · 2026-10-01
No. If you can't place a number you take a System Error and perform no action that turn. The Planning X is always an extra space on top of the number you legally placed.