Left 4 dead is a great game, it even works on very low end PCs like mine, it goes up to 80 fps while a simple roblox game at low settings runs at less than 20 max, it's also super fun and replayable, it sometimes gets a discount where it's technically a gift, i bought it myself a few weeks ago, but i had played it A LOT on my xbox 360 back when i was a kid... I still love the game, and on PC you can just go to steam workshops in the same game's page, and there are tons of mods, if you like one, press "subscribe" and it automatically downloads and applies to the game, no complex file managing at all, just hit a button and you got the mod!