Civilization II: Test of Time, released in 1999, is a turn-based strategy game similar to the best selling game Civilization II. Test of Time's central innovation was the addition of multiple maps and the inclusion of two campaigns concerning science fiction and fantasy themes.

Test of Time included an exact replica of the old Civilization II campaign, with only a few minor changes. Cosmetically, however, it looked quite different, with all-new art and animated units. Test of Time also offered the option to undertake the Extended Original campaign, which was identical to the Original except that the "pink" slot for a civilization was occupied by aliens on Alpha Centauri. When one built the Alpha Centauri spaceship, instead of ending the game, it unlocked a secondary tech tree and allowed the player to battle the Centaurians.

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