That spreadsheet idea is less silly than it sounds. I’d keep a few columns: wagering requirement, eligible games, withdrawal limits, payment options and support availability. Review sites can gather those details in one place, but check the operator’s own terms too, because promotions change. I found Spot Casinosのカジノボーナスガイド useful as a reference since its reviews cover bonus conditions alongside game selection, payment methods, support and drawbacks, not just the headline offer. And check local laws before taking any steps; a generous-looking promotion isn't worth legal or financial trouble.