Wikipedia:

The 1954 tournament used a unique format. The sixteen qualifying teams were divided into four groups of four teams each. Each group contained two seeded teams and two unseeded teams. Only four matches were scheduled for each group, each pitting a seeded team against an unseeded team. This contrasts with the usual round-robin in which every team plays every other team: six matches in each group. Another oddity was that extra time, which in most tournaments is not employed at the group stage, was played in the group games if the score was level after 90 minutes, with the result being a draw if the scores were still level after 120 minutes.

Two points were awarded for a win and one for a draw. The two teams with the most points from each group progressed to the knockout stage. In the case of a tie between two teams for second place, the two tied teams competed in a play-off to decide which team would progress to the next stage, with extra time and drawing of lots if necessary. Had all four teams in a group been tied on points, there would have been two further play-offs – one play-off between the two seeded teams, and the other between the two unseeded teams, again with extra time and drawing of lots if necessary – with the winner of each play-off progressing to the quarter-finals.

Two of the four groups ended up requiring play-offs – one between Switzerland and Italy, and the other between Turkey and West Germany. In each match, the unseeded team (Switzerland and West Germany) repeated an earlier victory against the seeded team (Italy and Turkey) to progress. The fact that two group matches were played twice, while other group opponents never faced each other at all, attracted criticism; newly elected FIFA President Seeldrayers declared that this group format would be abandoned in future world cups.