3 Level 4 monsters
If this card is Xyz Summoned using any Riddler Monster as Xyz Material(s), your opponent must answer the question in those monster's text within 10 seconds. Once per turn: You can detach 1 Xyz Material from this card; your opponent must answer the following question within 10 seconds: "How many monsters are Normal, Special of Flip Summoned during this Duel?" If your opponent guesses wrong, this turn, if this card battles, your opponent cannot activate cards or effects, until the end of the Damage Step, also halve the ATK of the attack target (if any), until the end of the Battle Phase. If your opponent guess correctly, halve this card's ATK, and, this turn, this card must attack, if able. If this card is destroyed by battle and sent to the Graveyard: You can target 1 Level 4 or lower Riddler Monster from your Graveyard; your opponent must then answer the question in the targeted monster's text within 10 seconds, and if your opponent guesses wrong, Special Summon that target, otherwise, banish it, face-down.