Rematches are rare in Countdown but do occur from time to time. Following the introduction of sudden death conundrums to prevent games ending in draws, the only way for two players to meet twice is to play first in the heats or the finals, and then play again in either the finals stage or a Championship of Champions tourmament. The Supreme Championship contained a rematch (from an earlier Championship of Champions event), as did the 30th Birthday Championship.
This list does not include rematches in the special episodes, which are often planned in advance, nor rematches that are produced as the result of draws (see the episode list in the Draw article for these).
Heat games with a rematch in the final stages
Heat games with a rematch in the Champion of Champions
Finals games with a rematch in the Champion of Champions
Rematches in the Supreme Championship or the 30th Birthday Championship
For more than twenty years, Natascha Kearsey and Pete Cashmore were the only players to have played each other in three competitive games, in the heats and finals of Series 35 and in the final of Championship of Champions IX. There would not be another "threematch" until Philip Aston and Zarte Siempre faced each other in a semi-final of Championship of Champions XV, after previously having played in the heats and grand final of Series 78.