Who goes first?
From the source rules

Who goes first in Big Monster?

Explor8 English base rules, official Dized reference

Big Monster base-game title artwork from the official publisher-maintained Dized rules

In the standard three-to-six-player game, everyone starts together: on a signal, all players take their tiles and choose one.

Official tie-break or fallback

No starting-player tie arises in the standard simultaneous mode.

Rule details

Choosing and passing tiles is simultaneous. The person giving the signal does not receive a separate opening turn.

Two-player play is sequential: the first player chooses a tile and discards another, then the second player chooses from what remains. That second player starts the next turn.

The special three-player variant also uses sequential choices and rotates the starter. The cited variant setup and turn sections do not say how to select the initial starter.

Source & edition

Image: © Explor8 and credited game artist Ivan Nikulin · Explor8 via publisher-maintained official Dized rules

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