Bigbang Monsters
Bigbang Summon/Bigguban shōkan are Red Cards with a Digital Pattern, they are found in the Extra Deck. they summoned by destroying 1 monster with the same type as the bigbang monster, and 1 or more monster's that has the same level as the summoned monster
they have Generation's instead of levels
as it is called as 1st Gen, 2nd Gen, 3rd Gen... etc.
as said before, they are summoned by destroying 1 monster with specific type (the same type as the bigbang mosnter) and 1 or more monster's that have the same level as the generation of the bigbang monster (like how it's used in Cosmicburst Dragon it is an 8th Gen monster,