No, Obelisk the Tormentor is not a Ritual Monster in the Yu-Gi-Oh! Trading Card Game. In the official TCG/OCG, it is categorized as an Effect Monster (specifically a DIVINE-Attribute, Divine-Beast-type monster). Unlike Ritual Monsters, which have a distinct blue border and require a specific Ritual Spell card and "Tributes" from the hand or field to be summoned, Obelisk has the standard orange/brown border of an Effect Monster. Its "God Card" status comes with unique summoning requirements: it must be Normal Summoned by Tributing three monsters, and this summon cannot be negated. While it shares the "Tribute" mechanic common to many high-level rituals, it exists entirely within the Main Deck as a standard (though incredibly powerful) Effect Monster. Some video games or anime episodes may feature unique mechanics, but in the competitive card game, it remains a standard Effect Monster.