The Ultimate Challenge to is play the Root challenge  with one map - Autumn, Mountain or Lake and win three consecutive days in a row.​  As some combinations are extremely difficult with AI on the hard setting, you can resign from the following combinations:

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AI set to hard. With this setting, there are various scenarios which are almost unwinnable - so you can resign if the following arises:

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• Beavers (on AI Hard setting, there will be hardly any buyers for the Riverfolk cards)

• Cats with no Vagabond to clear out the ruins

• Lizards with Alliance (the Alliance AI player on hard will set up in Lizard areas and blow them up with Revolt)

• Alliance with Lizards (as the Lizards will blow up the Alliance bases if it can, which makes it almost impossible to win with Alliance)

• Keepers In Iron with Lizards (as Lizards will blow up the Badgers waystations in preference to other factions, making it almost impossible to recover relics)

• Second vagabond with first being Tinker and your Vagabond plays directly after the first Vagabond (so very unlikely to get crafted items from other AI players) 

• Any race against Lord of the Hundreds as this faction is (imho) way over powered and very difficult to beat with any other the other factions.