Steins;Gate: Linear Bounded Phenogram

Steins;Gate: Linear Bounded Phenogram/Phenogram of Linear Restraint (STEINS;GATE 線形拘束のフェノグラム Senkei Kousoku no Phenogram?) a visual novel released on April 25, 2013 containing a mixture of canonical and non-canonical scenarios set during the original visual novel's story-line.

"The title is an apparent reference to 'linear bounded automaton', a limited form of the Turing Machine conceptin computer science."