What is a classic scarce resource in action games that is often hidden and can be collected to add to the player's count?

In some games, what is used as a resource where players can only play one card per turn?

What is a resource used to facilitate trade and create an in-game economy for other resources?

In a game, what becomes a resource when there is a limited amount of space that cannot be shared?

What is a simple resource in any game with a timer that counts down, representing how much time the player has for actions?

What are game objects like weapons, armor, and potions considered if they have utility and scarcity?

What is a resource that typically empowers a character for a short period of time, making the player decide to use it now or save it for later?

In some games, what is used as a player proxy and can be lost or renewable, usually with a cost of currency or time?

What is a resource that can help dramatize the loss of lives and units, and helps separate consequences into smaller parts?