In Das Kleinhorn vom Riesenwald, suitably played color cards let four giants rush through the forest to guard unicorns. There are an amazing number of them: little unicorns, no unicorns, piecemeal unicorns, and of course pig unicorns, slime unicorns and sunshine unicorns.
The giant of a played card color always moves through the forest. It runs to a unicorn of the type that can also be seen on the card that has just been played. The unicorn can be collected and guarded immediately. Usually another animal appears on the spot. If you also have a matching card in your hand, you can add that animal to your hoard, too. If you don't find a unicorn of the card you played in the forest, you can steal one from the other players.
When the day and the game end, whoever has the largest collection of small unicorns, no unicorns, piecemeal unicorns, and so on wins.
—description from the publisher