When Sprite Call is played as a hidden card from battlefield A and creates a Sprite during a showdown at battlefield B, where can the Sprite be played?

Ruling: When a hidden spell causes you to play a unit, you must play that unit at the battlefield where the hidden card was located.

Nuances:

• If Sprite Call were played from hand instead of as a hidden card, the Sprite could be played to any battlefield you control or to the base
• The restriction applies specifically because the card is hidden, not because of the showdown timing