Have you ever thought "Man, Doom is cool, but it sure could use some loot boxes"? If you did, today's your lucky day: a ZDoom mod brings the joy and excitement of utter and complete reliance on RNG mechanics to the original Doom released in 1993. It's never too late to ruin history (just ask George Lucas).
ZDoom is a fan-made version of Doom, used to this day to play and mod the classic FPS shooter. Recently, ZDoom forums member "Rip and Tear" decided to do everyone a solid and add the one thing original Doom sorely needed: lootboxes.
Instead of finding weapon pickups around the map like in ye olden days, the player starts with only a pistol and relies on random key drops from dead enemies to open random loot boxes hidden somewhere in the levels. And for those whales among us who rather pay than play the game, the mod adds a marketplace where they can "purchase" keys and lootboxes in single or in bulk, adding a very AAA vibe to the whole proceeding.
Luckily, the whole thing is a satire and the marketplace is not actually a functioning system -- trying to buy something leads to a generic error message about how the Doom servers can't be reached to complete the transaction. So if you want to spend money on Doom, you better hope Bethesda adds transactions to the sequel.