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 (with no vagabond) as this faction is (imho) way over powered and very difficult to beat with any other the other factions, especially if there is no vagabond so that the Lord faction can gain all the treasures in the ruins using mobs, making it almost impossible to beat.