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Yes, the untapped power that lies within you. Now, child, it's time you awakened that power and realized your full potential.
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The Drop System is a feature used in Kingdom Hearts 3D: Dream Drop Distance. It allows the player to switch between Sora and Riku to progress trough the game's story and obtain bonus prizes in the process. The player can drop manually by touching the "Drop" button that appears on the World Map, in the main menu, or in the pause menu. Also, the player will automatically drop when the Drop Gauge runs out.

Mechanics

Drop Gauge

The Drop Gauge, located on the lower-right of the screen, has three colored bars, cyan, yellow, and magenta, which continually decrease over time while the player is on the field, in sequence. It is underlined with a magenta-to-cream gradient. The Drop Gauge also has a multiplier, which represents the speed at which the gauge depletes. Certain enemy attacks will cause negative Status Effects, such as Sleep, that will increase the gauge depletion speed, meaning Sora or Riku will drop faster. The player can restore the gauge and reset the drop rate by using items like Drop-Me-Not, Drop-Me-Never, or Megalixir, and the Drop Decelerator bonus slows the gauge down, as does guarding with Wake-up Block.

Droplets

When the player defeats Dream Eaters, they can drop Droplets, special prizes that awards the player Drop Points (DP). Those can be later used in Relay Bonuses while droping between charaters to redeem various Drop bonuses. Drop Points can can also be awarded by completing Link Portals and collecting Lucky Items.

Bonus Time

 
Sora during Bonus Time. You can see the Drop Gauge flashing and the countdown number on it.

Once the Drop Gauge's magenta bar empties, it will leave an empty grey bar behind with a pink 30 second timer, warning that the player has entered Bonus Time. Enemies will drop Droplets more frequently during this period. Once Bonus Time ends, the player will automatically drop into the next character.

Relay Bonus

When Bonus Time ends, Sora or Riku will float in place, and the player will enter in the Relay Bonus screen. On it, the player can spend collected Drop Points (DP) to pick Drop Bonuses for the next character. Bonuses include temporary boosts in attack strength, new abilities, items, or a loss of speed at which the Gauge dissipates.