Monster Train: First Class is an enhanced edition of the roguelike deck-builder, tasking players with defending a train carrying a vital ember across multiple vertical floors from waves of invading forces. Managing units and spells across train levels remains central to its strategy.

Players build a deck combining different factions' units and spells, positioning defenders across the train's floors to repel each escalating wave. This edition offers a polished, content-rich version of the acclaimed deck-builder.