I have just released an initial preview version of a raycasting based 3D game for the TI-84 Plus CE: https://www.ocf.berkeley.edu/~pad/files/cellar-ti84ce.zip

For now this has only one small level with minimal gameplay (the goal being to escape the cellar before the radioactive waster kills you), but at least it works -- or so I hope!  This game is part in C and part in assembly language.  Right now it is running about 10 frames per second but optimizations should speed it up -- along with feature additions that slow it down.

I have now released version 1042 of Calcuzap, an asm shoot-em-up game for the TI-84 Plus C Silver Edition, TI-84 Plus CE, and TI-83 Premium CE.  This version includes 47 levels, user-selectable speed and difficulty, 6 types of power-ups including 3 enhanced weapons for the player, a starfield background (not available on the TI-84 Plus C Silver Edition), and a high-score table.

This new version adds pixel-exact collision detection, improved performance on the TI-84 Plus C Silver Edition version (no impact on the other calculators which are already fast enough!), and fixes a bug that would sometimes corrupt parts of the display on later levels when the enemies released escape pods.

The new version is not up on ticalc.org yet, but you can download it straight from the original source --  https://www.ocf.berkeley.edu/~pad/

Edit by DJ: fixed web link