The most CPU-intensive games are typically those that feature vast open worlds, detailed graphics, advanced physics simulations, and large numbers of NPCs or players interacting simultaneously. These games require significant computational power to handle their complex environments and game mechanics smoothly. As of my last update, here is a list of some of the most CPU-intensive games, noting that specific requirements can vary based on the game settings and the resolution at which you are playing:

1. Microsoft Flight Simulator (2020): Renowned for its incredibly detailed and vast open world, this game simulates the entire planet using data from Bing Maps. It requires a robust CPU to manage its real-time weather, air traffic, and detailed landscapes, especially at high settings.
2. Cyberpunk 2077: This open-world RPG is known for its detailed urban environment and deep simulation. The game’s dense population, advanced AI routines, and intricate physics demand significant CPU resources, particularly in crowded scenes.
3. Assassin’s Creed Valhalla: Like other entries in the Assassin’s Creed series, Valhalla features a large open world with dynamic weather, numerous NPCs, and complex AI interactions, all of which place a considerable load on the CPU.
4. Total War Series (e.g., Total War: Three Kingdoms): Strategy games like Total War require the CPU to calculate the actions of hundreds or thousands of units, manage AI opponents, and process large-scale simulations, which is particularly taxing during large battles.
5. Red Dead Redemption 2: This game’s vast open world, detailed physics, and high NPC count make it CPU-intensive, especially in bustling town areas or during fast travel.
6. Cities: Skylines: As a city-building simulation, Cities: Skylines puts the CPU to work managing thousands of individual agents (vehicles, citizens) simultaneously, especially as the city grows.
7. Hitman 3: The intricate levels, numerous NPCs, and complex AI interactions in Hitman 3 require substantial CPU power to render smoothly, particularly in densely populated environments.
8. Battlefield 2042 (or latest): Large-scale multiplayer shooters with advanced physics, destructible environments, and numerous players can be particularly demanding on the CPU.
9. The Witcher 3: Wild Hunt: Despite being released several years ago, The Witcher 3’s detailed environments, NPC interactions, and physics make it CPU-intensive, especially when modded for improved graphics.
10. Shadow of the Tomb Raider: This game is known for its detailed environments and complex physics calculations, particularly with effects like water and foliage, which are CPU-intensive.

When assessing the CPU requirements for these games, it’s crucial to consider the specific needs of each game at your desired settings and resolutions. Additionally, new game releases and updates can change the landscape of CPU-intensive gaming, so it’s always good to stay updated with the latest benchmarks and reviews.