What is the oldest game in the world? Is it hide and seek, when Adam hid from Hashem in Gan Eden?
Older than that is a game called "Simon says." In it, something happens, only because "Simon says" it should happen. When Hashem made the world, he did it through saying so. In fact, the original name was "shim'u, na, omer" -- listen up please, I'm saying something.
The oldest game in the world is Chess, as the medrash says
(קהלת ג יא): "אֶת הַכֹּל עָשָׂה יָפֶה בְעִתּוֹ גַּם אֶת הָעֹלָם נָתַן בְּלִבָּם מִבְּלִי אֲשֶׁר לֹא יִמְצָא הָאָדָם אֶת הַמַּעֲשֶׂה אֲשֶׁר עָשָׂה הָאֱלֹהִים מֵרֹאשׁ וְעַד סוֹף"( פירוט ): "מכאן, שהיה הקב"ה בונה עולמות ומחריבן, בורא עולמות ומחריבן, עד שברא את אלו"
Hashem created worlds and destroyed them, till He created this world
Why did Hashem create worlds and destroy them?
It is clear that Hashem was playing nuclear chess in which the winner gets to nuke his opponent.