Checklist and Proof: Every Reverse Tarot Card Unlock Requirement in Isaac

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Not every card ties to the Ultra Greedier post-it note. McMillen sequestered two specific cards behind challenges added in the 2021 expansion.

The World? requires beating Challenge #43: Hot Potato. You play as Tainted Forgotten, whose skeletal body functions as an exploding bomb on an inescapable timer. Clearing the challenge unlocks The World?, which creates a crawlspace trapdoor directly beneath your feet upon use. This guarantees immediate access to black market opportunities or extra consumables on floors lacking natural crawlspaces.

The Sun? and related alternate cards had adjustments during early Repentance patches (v1.7.5, v1.7.9b). Completing Challenge #42: Isaac's Awakening unlocks the Spirit Sword, which interacts directly with character mechanics used to burn through Greedier waves. If your post-it note marks fail to register a card unlock, verify your base save file has cleared the prerequisite challenges, as challenge completions occasionally override locked pool flags in modded or updated profiles.