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A Monster Card's Level is a rough indication of how powerful that card is, represented by a number of stars in the top-right.The maximum Level a monster can have is 12, and the Minimum is one. A Monster Card cannot be treated as Level 0, even with an effect, the minimum will always be Level 1 (excluding Mana Monsters)
Level 4 or lower monsters[]
Can be Normal Summoned to the field, unless a card condition specifically prohibits it, and/or implies a special condition in which it must be summoned another way, for example Rare Metal Dragon
Level 5 or 6 monsters[]
Can be Tribute Summoned by Tributing 1 monster on your side of the field, unless a card condition specifically prohibits it, and/or implies a special condition in which it must be summoned another way.
Level 7 or higher monsters[]
Can be Tribute Summoned by Tributing 2 monsters on your side of the field, unless a card condition specifically prohibits it, and/or implies a special condition in which it must be summoned another way.
You must only Tribute 3 monsters if the card allows it (Such as to unlock the effect of Moisture Creature), or the card's Summoning Conditions require it (Such as with Victory Dragon).