Overdrive (オーバードライブ)

Overview
Overdrive (オーバードライブ) is a Japanese Yume Nikki Fangame created by Amata, who also developed Farewell and Negaigoto (ねがいごと).

Gameplay
You start as a girl named 323, staying in a laboratory-ish room and doesn't want to go out. She can travel to a world called Outer World by entering the capsule machine in the room. Her purpose is to collect all Concepts in the Outer World. You can save the game by interacting with the personal computer.

You can also play as an unlockable character named 543, a boy that stays in a patient room and doesn't want to go out, after you find the way to meet him in Outer World. He can travel to his dream world by sleeping on the bed. His purpose is also to collect Concepts in his dream world. You can save the game by interacting with the notebook on the desk.

Controls

 * Arrow Keys - Movement
 * Z, Enter, Space Key - Interact / Select
 * X, Backspace, Insert, 0 (with Num Lock) - Open and Close Menu / Cancel
 * Shift - Concept Special Action
 * Tab Key - Back to the room
 * F12 - Back to title screen

Effects
The effects are called Concepts (コンセプト) in this game.