This "radioactive pooping knights" idea came from an Irish primary school chess website [2]. Really simple idea, two knights moving around the board leaving poo behind... Don't be the one forced to step on it.

* best played with sound on.

[1]. https://minichessgames.com/#/movement/knight

[2]. https://ficheall.ie/

*highly subjective, may not be better for you to play with sound at all ;)

p.s. Any "buy me a coffee" goes to my daughter. Annoyingly they only pay out once you get above $10 USD and I think it's currently sitting at 9.85 or something!