Code A Ancient Ruins is a Continuous Spell Card.
Spell Cards are usually activated from the hand on your turn unless their type gives another timing window.
On the current TCG and OCG Forbidden & Limited lists tracked here, Code A Ancient Ruins is Unlimited.
YGOPRODeck lists Code A Ancient Ruins for these formats: Duel Links, Edison, TCG, OCG, Master Duel.
Code A Ancient Ruins belongs to the Alien archetype—use that tag when searching for engine pieces and tech options.
A listed print of Code A Ancient Ruins appears in Crimson Crisis (CRMS-EN088) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Code A Ancient Ruins is about $3.55 on eBay (prices change frequently).
