First up is the save/load system, which is about 95% complete at the moment. I've gone through and ensured that absolutely everything is being included in the save file data and that quarantine zones that have been spawned already are recreated exactly the way they were at the time the game was saved. I also have the type, position, and other important data stored for each and every zombie, the only current exception being corpses - for the alpha release I will likely leave that as is since it is not anything that needs to be in place for the first round of public testing.

It's pretty straightforward and I've done my best to tie the layout of the save/load UI panels into the graphic novel theme of the game's UI. One thing to note is that the save game data is actually contained within the screenshot that is used for each cell of the panel, so there are no .dat or .json files to speak of. I do this by taking a screenshot at the time the save file is created and then embedding JSON data directly into the screenshot file itself; this JSON data is then extracted from the image file when the game is loaded, then parsed as any other save data would be. If you had a copy of the game now, you could load a saved game directly from the image file below by simply moving it to the appropriate folder and opening the load panel as you would normally; all the data is packed in there and ready to yanked out to recreate the game. Not only is this convenient, but I am quite happy with the panel's layout and the way in which the screenshots combine to construct a graphic novel page.

I've also added the biohazard zombie's vomit attack to gameplay, which up until now was only a proven concept tested in an alternate scene. I ran into an issue while putting this in place due to the fact that the particle system was already set to collide with the ground in order to have it collect in pools that the player may accidentally walk over and receive damage from. Simply enabling collisions between mid-air vomit particles and the player would result in the same pooling effect occurring on the player in a very unnatural way, so I had to find a way around this. I ultimately decided to split the vomit particle system into two separate prefabs; the first controls the bulk of the particles, all of which collide with the ground same as before; the second controls only a small fraction of that which cause damage to the player on contact and its particles are destroyed on impact; since both systems look exactly the same to the player, they won't notice any difference during gameplay but the end result is that I get both the pooling effect and player damage with very little work required to pull it off. So now the player will take damage anytime they touch the radioactive vomit, regardless of whether it is in the air or pooled on the ground. The video below shows the radioactive vomit working in a recent playthrough as well as a demonstration of the separate particle systems being used, one system changed to a different color to emphasize the difference.