Play Outer World (Japan) Online

Alter World is a puzzle-platformer with a painting art style. The game has about 80 short levels, each consisting of a single screen and its darker, alternate version. In each level, the goal is the same: just get to the exit door. You can switch between the main screen and its "alter" at a press of a button (often while you are mid-air, often multiple times while mid-air). While there are almost no enemies, most levels have spikes which kill you at a single touch, forcing you to restart the level. Other puzzle elements include moving platforms, bouncing pads, teleportation portals and gravity-changing switches.