I started the collection a few months ago, but it started to grow by now.
3X3X3
Constrained Cube
A 3x3x3 which twisting abilities can be contrained by various pieces. Mass produced versions of seven variants exists.
Rubik's 4th Dimension
Made in the late 1980's. Four special stickers reveal the orientation of their faces.
3X3X3 (PICTURE)
4X4X4
MOVING HOLE
PATTERN MATCHING
Rubik's Dice
A great little puzzle that keep you busy for hours!
OTHER MECHANISMS