Bit.Trip is a series of action / music games that has been released on Wiiware download service for the Nintendo Wii. The series has been started in 2009 and finished in 2011. It was developed by Gaijin Games and published by Aksys Games. Each game revolves around the adventures of a character named “Commander Video”, and features “a crazy mix of 80s aesthetics and modern game design”. (Info from Wikipedia)

Six games have been released for Bit.Trip:

• Bit.Trip Beat, first one of the series, which introduces a style of pong;
• Bit.Trip Core, second one of the series, which introduces a style of more peculiar rhythm, similar of Dance Machines;
• Bit.Trip Void, third one of the series, which introduces a different rhythm;
• Bit.Trip Runner, fourth one of the series, introduces a new style, with 2D Platformer with rhythm;
• Bit.Trip Fate, fifth one of the series, introduces a new style of side scroller shooting with rhythm;
• Bit.Trip Flux, sixty one of the series, Gaijin games have returned the Bit.Trip Beat style.

Some of those games have unused stuff hidden in their code, such as animations and sound effects.

Bit.Trip Beat

There is a different game over screen in the first game of the serie. Later, it’s never have been used:
Video:

Bit.Trip Core

In Bit.Trip Core, there are still sprites for WiiRemote that appears in Bit.Trip Beat, probably the game could be different.

Bit.Trip Void

There is some testing stuff into the title screen folder. It’s really unknown about it:

Bit.Trip Runner

There is a unused idle animation, which probably would be used if the player left controller. Maybe, just discovering this animation, the game could be a lot of different, it could probably a sidescroller which you could move manually, and if stops, it could appear this animation rarely. However, Bit.Trip series have the main goal of rhythm, so they retired the animation and did as automatic sidescroller game (probably).

Video:

Bit.Trip Fate
Originally planned to be a more traditional shooter where CommanderVideo was in a ship and he had free movement around the screen. The game also did not use pointer controls or the “fate line” until a later date.

Bit.Trip Flux
Started off using Breakout style gameplay during the normal course of the levels, but was cut because it simply wasn’t that fun. Bosses also used to be at the beginning of each level, reinforcing the reverse nature of the game, but that upset the pacing right away.

The whole serie:There is a sprite which appear in all the games, into the game files. Probably, it’s only used in Japanese Version:

Those sprites only appears on the Japanese version of the game:

Translation: BIT.TRIP VOID’s sytem file is corrupt.
After erasing BIT.TRIP VOID from the Channel Management Screen, please redownload BIT.TRIP VOID from the Wii Shopping Channel.
If you still get the same message afterwards, please contact the Nintendo Service Center.

Translation:
BIT.TRIP CORE’s sytem file is corrupt.
After erasing BIT.TRIP CORE from the Channel Management Screen, please redownload BIT.TRIP CORE from the Wii Shopping Channel.
If you still get the same message afterwards, please contact the Nintendo Service Center.

Translation: BIT.TRIP RUNNER’s sytem file is corrupt.
After erasing BIT.TRIP RUNNER from the Channel Management Screen, please redownload BIT.TRIP RUNNER from the Wii Shopping Channel.
If you still get the same message afterwards, please contact the Nintendo Service Center.

Thanks to Gabrielwoj and Susumu (translation) for the contributors.