GNU Gnubik is a puzzle

Puzzle

A puzzle is a problem or enigma that tests the ingenuity of the solver. In a basic puzzle, one is intended to put together pieces in a logical way in order to come up with the desired solution...

 game

Personal computer game

A PC game, also known as a computer game, is a video game played on a personal computer, rather than on a video game console or arcade machine...

 - a software implementation of the Rubik's Cube

Rubik's Cube

Rubik's Cube is a 3-D mechanical puzzle invented in 1974 by Hungarian sculptor and professor of architecture Ernő Rubik.Originally called the "Magic Cube", the puzzle was licensed by Rubik to be sold by Ideal Toy Corp. in 1980 and won the German Game of the Year special award for Best Puzzle that...

. It is cross platform and is included in all major operating systems including Debian, Red Hat and Ubuntu.

Features

As well as being a simple game, it has selectable colours, patterns and one can
even use photos as the tiles on the cube. It has scripts to solve part or all of the puzzle automatically.
And the user can rewind what's been previously done, all the way back to the beginning or back to a previously placed marker.

External Links

• http://www.ghacks.net/2010/02/06/waste-plenty-of-time-with-frozen-bubble-and-gnubik/ - Gnubik and Frozen Bubble the two best procrastination programs.