Saudi Arabia's Public Investment Fund (PIF) will pay $3.5bn (£2.7bn) to buy the gaming division of developer Niantic, whose titles include the hit mobile game Pokémon Go.
The game involves players walking around in the real world to hunt the collectable creatures, which appear on their phone screens using augmented reality.
Despite launching almost a decade ago, Pokémon Go is still amongst the highest-grossing mobile games in the world, with 30 million monthly players.
The deal marks the latest step by Saudi Arabia to develop its gaming industry, which it has spent billions of pounds on in recent years.