Quick answer: A tied Banana Ball game moves to a Showdown: hitter versus a reduced defense, with the setup changing by round until there is a winner.
Round 1
Pitcher, catcher and one fielder face one hitter.
Round 2
Pitcher and catcher face the hitter with no extra fielder.
Round 3 and later
The format returns one fielder and uses loaded bases, with every run counting as a point. If the tie survives, the rounds continue.
Instant walk-off
A home run over the outfield wall can end the Showdown immediately.
See the full Banana Ball rules guide for the other ten core rules.