However, here’s a to getting classic and free games running on Windows XP (as of 2021-style availability, but applicable today with precautions):
(though official Microsoft servers for these may be offline) Popular Free-to-Play Games Supporting XP (As of 2021)
For those who are nostalgic for the good old days of Windows XP, there's some great news: you can still play free games on this classic OS in 2021. Yes, you read that right - there are still many websites and developers that offer free games compatible with Windows XP.
: A massive fan-made project that compiles the best of the classic series into one free XP-compatible package.
(Doukutsu Monogatari) : A legendary indie action-platformer that remains entirely free in its original version and runs perfectly on Windows XP. AssaultCube