It's known that Dopamine (The enjoyment hormone) is triggered by the expectation of a Reward and not by the Actual Reward (That's why gambling is so addictive).
Many studios have been capitalizing this fact by turning their Rewards and Energy systems into mini games where the player has to select between possible rewards or just wait for...
I2 MiniGames -- (A better way to do Rewards and Energy Systems) --
