I am what I would call an old hand with computers but totally new to the Raspberry Pi. I am using it to try to learn Python and for this purpose I have copied out a program from "Raspberry Pi for Dummies"
I have saved the game in the folder home/pi - this may or may not be relevant!
Now for some unknown reason the "Python Games" prompt has disappeared from the "Main Menu". Under "Games" I just get "Minecraft Pi".
For the avoidance of doubt, the folder "python_games" remains intact and I can run them by "double clicking" the appropriate PY file or by opening the code in "Thonny" and selecting "F5".
The machine is a Pi3 using LXPanel 0.9.3