32 Players maximum, split into 8 x groups of 4.

Play a single game against each other member of the group. (3 machines)
Top 2 from each group goes through to knock-out stage.

Then head-to-head single-elimination games all the way through to the final.

16 -> 8
8 -> 4
4 -> 2
2 -> 1

(4 machines)