Majordomo Felix's Trial
From ggFTW Trickster Wiki
"Easy" Sudoku Puzzle Results:
After the dialog has ended with Majordomo Felix, you will be presented with a Sudoku logic puzzle. However, after passing the first, you'll have to endure a second set, typically more difficult. There are two sets of results, one for each level of difficulty. Generally, it isn't too difficult to discern which type of puzzle you're working with, and when in doubt, just look for the results that look best, matching up the numbers around the answer in the result page to the one presented in-game.