What are some video games that made you a better gamer?
For example, I am terrible at Super Meat Boy, but just playing it has really improved how I play platformers and games that need faster imputs overall.
Counter-Strike: aim accuracy and incredible keyboard-mouse hands eye coordination. Also, being able to grind and mental simulations of possibilities to be ready against them. It is like chess but with consequences.
Need For Speed: Most Wanted, Carbon, Underground and Underground 2 require you to use manual gears if you want to improve. Also, those titles involve a lot of manual car equipment tuning. The precision required on keyboard is almost equivalent to the combined precision you would need for Counter-Strike with both keyboard and mouse.
Pocket Tanks: incredible amount of guesstimation with projectile classical physics, and being creative with the use of weaponry. To make it harder, I always play against CPU-10 with always selecting "Random" weapons to learn to make the most of what I have.
Kaizo Mario would be some of the fanmakes like World of Stupidity. This rabbit hole goes way too deep. I am one of the best MF players in the world, and have been unable to complete one level to this day, which nobody else has either. One day I want to.