Japanese Virtual Boy V-Tetris Bullet-Proof Software Inc. sales promotion toy:

Although the true character of the object is a mystery (we refer to looking at the photographs) 
It seems that it is a structure in which a 1.5v LR-41 battery is inserted, which makes it emit light as far as I understand, look at the backside photograph and see how it seemingly is a shining toy that can give light. Quite possibly it works much like a twist&turn cube in the sense that you can change it's shape like a puzzle while trying to make Tetris blocks.
Original price: ¥500
Releasedate: 30 September 1995

Ad & Manual of how the toy works:

Front:

Back: