This subtraction game is particularly interesting: https://upload.wikimedia.org/wikipedia/commons/4/4d/Subtract...
fgnegre jvaf, nyjnlf pubbfr crapvy orybatvat gb gur yrsg bs n zhygvcyr bs sbhe (jvgu crapvyf ahzorerq sebz bar gb gjragl bar)
(Decipher with https://rot13.com/)
This subtraction game is particularly interesting: https://upload.wikimedia.org/wikipedia/commons/4/4d/Subtract...