Can cards in the Hidden zone be played for their normal cost without targeting restrictions, and do they gain the Reaction keyword?

Ruling: Cards played from the Hidden zone (after being hidden with one power) must follow Hidden rules - they are played for free at reaction speed with additional targeting restrictions ("here" added). They cannot be played for their normal cost to bypass these restrictions once hidden.

Sequence:

• Pay one power to hide cards in the Hidden zone
• Starting the following turn, hidden cards gain the Reaction keyword
• Hidden cards can then be played for free at reaction speed from the facedown zone
• When played from Hidden, targeting restrictions apply ("here" is added to targeting)

Nuances:

• If you do NOT hide cards (don't pay the one power), you can play them from hand for their normal cost as normal cards
• Once you hide a card, you cannot later take it back and play it for normal cost as a normal card
• Tide Turner is an exception to the "here" targeting restriction
• Cards gain Reaction the turn AFTER you hide them, not immediately