During his foray through the forest, Klaus the mouse finds fruits and leaves, animals and tracks, different animal families and much more. A good memory helps to sort everything and find pairs. The youngest forest pro starts and takes the top search card and looks at it. The task is now to find the matching forest card. The forest card has the search card printed small as the solution. So you have a check if you are right. You now go with the search card to one of the forest pieces. Lift up the forest piece and look underneath to see if the matching card is underneath. If the forest cards are still hidden under the forest piece, you may uncover them- They remain face up underneath. If you find the matching card, you get to keep it. The forest card is now placed in front of you. If you have six different forest cards, you can use them to lay a tree. If you don't find the matching card in a passage to the forest piece, it's the next player's turn. The search card goes back face up next to the search card pile. The next player moves to the next pile with Klaus the mouse. The game ends when 3 trees can be formed. The player who has the most search cards in front of him - that is, who has successfully found the most pairs - wins the game.