Yeah I didn't even remembered we had this. There'S also a version by CDI/Zeromus for 3 and 4 lv. BOth use different approach than our new GS kit in the works though. Kalan's technique for 5 lv grayscale is to draw a checkered pattern similar to 3 lv grayscale, erase it, then draw the second checkered pattern frame, then erase it, and so on. FOr light gray it's turned white when erased and for dark gray it's turned black. For middle gray it just keeps moving every frame like my old 3 lv grayscale technique. Easier to draw sprites/tiles for such method, but the grayscale quality is questionable (middle gray looks great, though). CDI technique uses a modified technique since it's 4 level, but the quality isn't too good either and it appears to be for an older version of xLIB.

The method I use in the Grayscale Package uses Celtic/xLIB to create non-destructive xor logic sequences so that the grayscale can be rendered without destroying the static sprites. This makes it possible to use it in situations where the display may change, such as an rpg or tile-based map.

Well that method was used in some games before but it flickers extremly badly. With xlib Recallpic function you can overwrite the entire screen with a pic so you doN't need to clear it before recalling a pic, meaning flickerless animations and/or grayscale that is close to flickerless. But I only recommend xLIB and Celtic for those who mastered TI-BASIC because even myself after 4 years of BASIC programming ended up checking the xLIB readme everytime using a function

That's about when I starting using it and it's pretty amazing it takes a while to get used to but it rocks.
Edit:Wewt 200 posts!!

The readme is a great place to start an there is a small tut on it.
http://tibasicdev.wikidot.com/xlib-tutorial

Keep in mind Celtic has most xLIB compatibility and more functions, just ask if you have any issues.

CelticIII is much better not quite as easy but it has sooo much stuff to work with.