Boardgamegeek https://boardgamegeek.com/boardgame/7483/schatz-der-drachen
English - Schatz der Drachen is a memory variant for children. The goal is to collect as many of 49 cards as possible. At start, the cards are layed facedown on the table in a 7 x 7 grid. In their turn, players may reveal as many cards as they like until either they want to stop or they are forced to stop.
Ludovox http://ludovox.fr/jeu-de-societe/tresor-des-dragons-372/
French - Un jeu de Reiner Knizia.