Beyond the Tesseract

Early (1983) TRS-80 BASIC text adventure game, the middle in a forgotten trilogy (sandwiched between “Project Triad” and “Codename Intrepid”), remembered for its no-holds-barred approach to math and logic concepts informing game settings and puzzles: in one section, sparking a genre cliche, one has to play a text adventure game inside the text adventure game; in another, one falls asleep and in a dream constructs a proof utilizing physical representations of various components of symbolic logic; additional game areas are accessed by pushing and popping the stack, objects extruded from 2 to 3 dimensions by _y_ing them.