Nano-game, n.
                           1. A game that's smaller than a micro-game or mini-game.
                           2. A game contained on a card or similarly small format.
                           3. A game measured in words rather than pages.

                           4. A shockingly short but complete game.
                           5. A "science-fiction-y" descriptor for a tiny game
                           6. An arbitrary term keeping neither design in nor designers
                                out.

                          Etymology.  A marketing term for a small game, which came
                                                    into vogue among independent game designers
                                                    in the spring of 2013.

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The slightly longer but to0-cool-to-miss  World of Dungeons, GHOST/ECHO, and Lasers and Feelings by John Harper