It has different names in different languages:
English: Elephant Super Memory Challenge: Recall This!
French: Challenge Elephant Super Memory: Rappel Ce!German: Elefanten Gedächtnis Herausforderung
Swedish: Elefantminne: Memorera detta!
Dutch: Olifant geheugen: Dit memoriseren!
It's a game that presents a string of objects, either alphabetical or numerical or both, or colors, or smileys. After a while (the player chooses how long a while) they become hidden. Now it's up to the player to repeat the sequence with a suitable keyboard. You decide how long the string is and how long time you have to input the sequence.
Here's the game icon: