At least in U5, if you clear a dungeon room it stays cleared, so the next time through Dungeon Doom is lot easier. U4 really kicked us in the crotch, though, w

At least in U5, if you clear a dungeon room it stays cleared, so the next time through Dungeon Doom is lot easier. U4 really kicked us in the crotch, though, with its "INFINITY" riddle ending. There was only an extremely vague way of figuring it out: each time you would get an eighth, a runic letter would be put on the screen. But reading runes wasn't really required for U4, so at the time I didn't even recognize them as runes. Entirely by coincidence, I had a card where I had all the virtues listed horizontally, and I manually drew the "weird symbols" I saw at the bottom. When you play U5 you get good enough to read runes by heart, and I glanced at that card once and immediately saw the answer leaping out at me.