Mix the cookies with softened butter. Put the resulting mass into the form and, distributing and compacting it, form a base with sides. Put the base in the refrigerator.
Add sugar to the water with gelatin and heat until it dissolves over low heat.
Place the yogurt in a deep bowl and add the gelatin through a sieve, mix well.
Remove the pan with the base from the refrigerator, place the berries on it, pour in the yogurt mixture and put it in the refrigerator for 120 minutes.
Cut the finished dessert into portions and serve.