Get it now and keep it forever.
Super Meat Boy which released in 2010, is the one of the hardest platform games in gaming history. Today this game became free for all PC players.
Epic Games stated that they will giveaway a free game every fifteen days. Subnautica was the first game they gave, and now the second one Super Meat Boy became available now. You can get Super Meat Boy from Epic Games Launcher or the website.
Super Meat Boy is a tough as nails platformer where you play as an animated cube of meat who's trying to save his girlfriend (who happens to be made of bandages) from an evil fetus in a jar wearing a tux.
Super Meat Boy Windows system requirements
Super Meat Boy Mac OS X system requirements