Here is a curated list of the best games that weigh in at under 50 megabytes. Note that "highly compressed" often means the installed size might be slightly larger (up to 150MB), but the download (ZIP/RAR/7z) is under 50MB.
This is the most critical section. Searching Google for "50MB games" leads to shady ad-infested websites. Here are the safe havens: Highly Compressed Pc Games Under 50mb
You might wonder how developers shrink a game to such a tiny size. They use several techniques: Here is a curated list of the best
Do not run games from inside the ZIP/RAR file. Highly Compressed Pc Games Under 50mb
Start your collection today. Your 32GB USB stick will thank you.