A famous plaything, beloved by geeks
If you are like many, my meaning you'll seek
From six letters to five, I'm a journey complete
You can play me once, but you won't get a repeat
Who am I?
You are
Life (or one of two Games of Life)
I'm a famous game, beloved by geeks
John Conway's Game of Life is famous and beloved by geeks
If you are like many, my meaning you'll seek
People seek the meaning of life
From six letters to five, I'm a journey complete
From CRADLE (6) to GRAVE (5)
You can play me once, but you won't get a repeat
Once you die, that's it (unless you believe in reincarnation)
I refuse to quote Drake here.