what happens if there's a tie in mario's game gallery yacht

In Mario’s Game Gallery’s Yacht mode, a tie is usually broken so the game can still pick a winner rather than ending in a deadlock. One source about the game notes that Mario “will tally up a score for tiebreakers so there’s always a winner,” which fits that style of resolution.

What that means

If two players end up with the same score, the game does not just leave it as a draw. It uses a tiebreaker step so one player is declared the winner.

Why it feels familiar

Yacht is basically a Yahtzee-style dice game, so a tie-break system makes sense for keeping the match moving. A gameplay video also describes Yacht as “pretty much the same as Yahtzee,” which lines up with the idea of resolving ties through scoring rules.

Bottom line

A tie in Mario’s Game Gallery Yacht should not stay a tie for long; Mario’s game appears to resolve it with a tiebreak score so there is always a winner.

TL;DR: ties get broken, not left undecided.