I have a demos for nVVVVVV!
No screenies because KArmTI isn't letting me install ndless, and Norton thinks nspire_emu is a virus.
Attached are the sources, the makefile, and the binary (Ndless 3.6, not sure if it will work with 3.1).
So far, you can only move left/right and flip gravity.
7/9 = left/right
8 = flip gravity

Will someone please make some screenies (CX and/or Grayscale)? Thank you

Github repo: https://github.com/pimathbrainiac/nVVVVVV/
Binaries: https://github.com/pimathbrainiac/nVVVVVV/releases/

Take the n off the title and I'm happy. Also does this work with ndless 3.1?
Edit: doesn't seem to work with ndless 3.1 I get a "This document format is not supported" error. >.<

I would compile it under ndless 3.1, since all the code is compatible, but I can't find the ndless 3.1 sdk
Could someone who has it please attach the zip file?

Well, the only libraries I'm using are OS.h and nSDL, so it should work.

EDIT:

Take the n off the title and I'm happy. Also does this work with ndless 3.1?
Edit: doesn't seem to work with ndless 3.1 I get a "This document format is not supported" error. >.<

According to Levak, you need to update ndless 3.1

EDIT 2: new version, fixing some tile things, attached.

be sure to make that work on monochrome Nspires too, I'll want it

I could tell you were using nSDL without reading, just by trying this on CX and non-CX. The speed difference is striking, see screenshots. I had problems with that too, even though I used SDL_DisplayFormat, so with pierrotdu18 and matref we started a new lib. Functions from that lib were used in Jetpack Impossible if you want to use them. They use the same format as nSDL (just remove all the "0x2a01" and you're set).

I'm trying to use the header from Jetpack Impossible, but I have a problem: I store my sprites in a spritemap, and blitting does not seem to be supported inherently by the library. So the question: How do I blit my spritemap in program?

I either said something wrong, or you or I misunderstood the other:

I have a spritemap, that is, one image with all of the sprites in it. SDL has the function SDL_BlitSurface(surface, rect, screen, screenposition), which not only displays the sprite, but blits/crops the pointed surface so that only a specific region of said surface is displayed/drawn.

putsprite(x, y, ptr) displays the entire pointed image on the screen. Is there/can you make a routine that crops/blits the pointed image to a specific x/y/w/h?