Just because Covid-19 prevents us from holding game nights does not mean that board gaming should end! You may be at home, maybe even alone, and in those cases you should explore the world of Print n' Play for one player.
Below you will find a list of some well-liked games as well as a video showing how they are played and how you find more. There are also many more suggestions in the comments of the video.
Some good games:
Bargain Basement Bathyspher
Mr. Cabbagehead's Garden
Deep Space D-6
The Wild, Affordable World of 1 Player Print'n'Play Games - Shut up and sit down