Plunked down many a quarters on games like Donkey Kong, Pac-man, Centipede, Dig Dug, Tron, etc… but the ones I probably spent the most on were Hard Drivin’ and it’s sequel - some of the first games to feature 3D environments and force feedback steering. It was the next best thing to driving a real car.
…geez, I’m old 
Donkey Kong.
Primal Rage.
Star Wars Trilogy Arcade.
That’s all I can think of now.
Dynamite Cop.
Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.