Algodoo

Yep, i can see now (i think). Iris is the culprit.
Green said that the bathrooms were nowhere near the dorm rooms, and Cyan said that there was a blood track from the dorm rooms to the kitchen. I can deduce from this, that Pink never went to the bathroom during the crime. If she was knocked out in the bathroom, there would've been either a blood track from the bathroom to the kitchen, or no blood (because the culprit could've washed it of). Another thing proving that Pink was not knocked out in the bathroom is the blood on the handle of the ice locker. Like Forest said, there should've been some blood on the killer after knocking out Pink (she was bleeding because of that), so if Pink was knocked out in the bathroom, i think the killer would've washed the blood of, to destroy any tracks. But they didn't. Because they couldn't. So i think Pink was knocked out in her own room. (second part of explanation later)

(this is second part of explanation)
And Iris was the only other person in the room with Pink at the moment, meaning if the killer is not Iris, she would've noticed the killer, and she would've brought that up during trial. But she didn't. And you know why. She is the culprit. It would've been easy for her to make something up, but she didn't. I'll say exactly how Iris killed Pink soon.


Also, if my explanation is the most correct, can you please give Green more development? He was the mastermind of the last killing game, so i think there's something about him he hides.

So first, Iris went to the kitchen to get a spatula from the kitchen she wanted to use to knock out Pink. Unlucky for her, Hot Magenta was still there, so she forced her to drink the potion, which maybe actually could be poison, which knocked HM out. Iris took her spatula, and quickly left the room. She then went back to Pink, to whom she promised to lock themselfes in their room. While they were talking, Iris suddenly beated her with the spatula several times, knocking her out. She left Pink's body there, and went to the storage room to get some nails. After coming back from the storage room, she went back to Pink's room to get Pink's still knocked out body, and dragged it all the way to the kitchen. She made sure to turn off the lights in the halls she was walking in so nobody could see her. This could explain why the lights were off in the halls Red was walking in in the deadly life episode. After arriving at the kitchen, Iris put both Pink and Hot Magenta's bodies in the ice locker, grabbed the two nails she got from the storage room, and used them to impale the nails to the arms on the wall. She put then put the bloody spatula on the ground, grabbed the kitchen knife, put blood on it, and put it in the ice locker to throw everyone off. She then used the faucet to wash the blood off of her hands, and quickly left.

100%. Character?

Oh sorry nevermind- Green will have a major part next episode.