I probably created over 100 custom levels on Lode Runner and another 100 custom levels on Floppy on my old Apple ][ computer.
I spent way too much time playing Spider Raid, Spare Change, and Sea Dragon.
I dropped a lot of quarters in the arcade playing Qix and Mr. Do!
In my spare time, I played Pac-Man, Frogger, Sonic the Hedgehog, Donkey Kong, BurgerTime, Bejeweled, BC's Quest for Tires, Castle Wolfenstein, Congo, Dino Eggs, Joust, Tetris, Zaxxon, etc.
Lode Runner came with 150 levels, but also was the first major title to allow you to create your own custom levels. I spent hours building nearly-impossible levels, much to the chagrin of my friends and family.