From the game Cogmind. Get it here.
How to play Tetris on most Canon calculators, from a video by brusspup. You can also play Defender.
From the text-mode game Dwarf Fortress, in development for 10 years already. It generates a new map every time you start the game and this is one of them.
Sammy the Sea Serpent for Atari 8-bit, 1981. Excellent text-mode story telling for kids, with minor interaction. Runs both data and audio from the cassette at the same time, according to atarimuseum.
h/t: drx
Chrdius, a Gradius-like game in text mode. Made in Petit Computer – a BASIC-environment for Nintendo DS.
h/t: 4mat


Back to Nature by Bob Carr, 1982. This is the C64-version of the game that he released for the PET in 1980.



Receipt Racer by Undef & Joshua Noble, 2011. Using a Playstation gamepad, the user controls a car that is projected on to the paper coming out of the receipt printer.