what do you play normally? At best you play games you have played "dead". Really increases replay value.
We can't really give you any decent suggestions without knowing what you want. What genres you like, what length you want, how RNG dependent it is, glitched/glitchless, what platforms, etc?
Well, I don’t really have a liking. I mainly stick to Nintendo games though. And I some mobile, and I never do glitches.
Edit: Punctuation.
For example, I play Hot Wheels: Race Off, which is mobile, and have also played Mario Kart Wii, which is a Wii/WiiU game.
Thank you for your feedback, but I don’t think that would be a game to speedrun for me.
You've played a hot wheels game / other driving games, I recommend HW: World's Best Driver or HW: Beat That
Boodunnit?! Is a good one, its a cute 3d platformer where you solve your own murder. It's quite short being under 10 minutes. Just a suggestion