Towers of Hanoi (digital version here: https://www.mathsisfun.com/games/towerofhanoi.html)
Caesar Cipher (digital version here: https://www.dcode.fr/caesar-cipher)
The Game of SET: https://www.playmonster.com/brands/set/
Zome tools and bubbles (video here: https://vimeo.com/333411852)
Topology Tricks: https://mathedu.hbcse.tifr.res.in/topology-games-and-puzzles/
The Utility Problem: https://www.youtube.com/watch?v=VvCytJvd4H0
Fun YouTube Channels:
Outreach at CSU archives: https://mathematics.colostate.edu/outreach-events/math-jam/archives/