The Main Deck (メインデッキ) was the fourth obstacle in the first two regular VIKING tournaments. The obstacle consisted of two mast poles (one skinny and one large) that the competitor could choose from the crossover to the second half of the course. The poles had to be placed in support holes in order to create a path to then walk on. The large pole was the heavier of the two which could waste time if the competitor wasn't strong enough to lift but was the easiest to cross. Likewise, the skinny pole was the lighter of the two which would save time but because of it's small diameter, was difficult to cross. It was replaced by the Island Escape in VIKING 3.

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