Square Royal is a 1995 card puzzle played on a 4x4 board. You place cards into the grid one at a time and try to arrange them according to the game's rules, which puts it closer to a quiet logic exercise than to a conventional solitaire. A round is over in a few minutes.

It comes from Jörundur Sveinn Matthíasson and was released as part of his small Icelandic shareware line. Icelandic PC games from the mid-1990s are rare, and this handful of tiny titles is close to everything that survives from the local hobbyist scene, though the country attribution mainly rests on the author's name. The file is a Windows 3.1 executable, not a pure DOS program.

Square Royal is a catalogue entry here and cannot be played directly in the browser.