Revolution-FX indeed is a library that extents the Casio SDK, it is made by kucalc.
kucalc is an (inactive) admin at this forum, he has rank "Casio Maniac", he knows everything about the fx-9860.
In the library are faster drawing functions, greyscale engines, timer functions (Real-Time Clock) and also serial port communication (could be used for calc-to-calc gaming).
The site posted by flyingfisch is the project page of Revolution-FX:
But there is a newer version of his library at this topic:
V 1.0 supports a function that displays text in sizes from 5 pixels to 9 pixels and drawing functions are improved.
Something about my game:
It is a bit based on snake, but the goal is reaching the other side of the screen, your tale won't disappear so you have to look out for your own tail.
Im also going to randomly spawn walls and some more things, but i didn't worked that out yet.