Smile World is a Normal 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, Smile World is Unlimited.
YGOPRODeck lists Smile World for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
A listed print of Smile World appears in Starter Deck: Yuya (YS16-EN022) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Smile World is about $0.11 on Cardmarket (prices change frequently).
