Slay the Spire is a deck building roguelike that starts off hard and gets even harder. A seemingly good start can quickly unravel as a result of a few careless choices, but is every seed actually winnable? Slay the Spire modder Forgotten Arbiter has been trying to find the answer to that question over the last couple of years. His research—which you can read in his detailed blog post—has proven that impossible seeds are incredibly tricky to find, even when concentrating on a single class.

While Forgotten Arbiter is yet to find an impossible seed, he’s put a lot of work into creating mods that may find the answer one day. What’s interesting is that this wasn’t his initial intention for his tool, SeedSearch, which was originally crafted to find seeds for speedrunning. 

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