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It means youre playing a two-out-of-three match with a sideboard, and no unusual rules

Given that both themes are mostly comprised of Fiend monsters, "Gruesome Grave Squirmer" can be used as a free extender then can freely Special Summon one of the Summoning Beast cards ("Dark Summoning Beast" or "Phantasmal Summoning Beast" in particular) from the hand or Graveyard after it is sent to the Graveyard

(Draw 1 card from your deck.) [Opponent's Turn] While a card with [Hybrid] in its traits is in this Digimon's digivolution cards, none of your opponent's level 3 Digimon can attack

To make double-faced cards, they had to have their own sheet, so we ended up making a slot in each booster have one